- Added solutions by Laurent Rosenfeld.

19 files changed, 1438 insertions, 1350 deletions

diff --git a/challenge-137/laurent-rosenfeld/blog.txt b/challenge-137/laurent-rosenfeld/blog.txt
new file mode 100644
index 0000000000..b0308b1b00
--- /dev/null
+++ b/challenge-137/laurent-rosenfeld/blog.txt
@@ -0,0 +1 @@
+http://blogs.perl.org/users/laurent_r/2021/11/perl-weekly-challenge-137-long-year-and-lychrel-number.html
diff --git a/challenge-137/laurent-rosenfeld/perl/ch-1.pl b/challenge-137/laurent-rosenfeld/perl/ch-1.pl
new file mode 100644
index 0000000000..884c69496d
--- /dev/null
+++ b/challenge-137/laurent-rosenfeld/perl/ch-1.pl
@@ -0,0 +1,21 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use feature qw/say/;
+use Time::Local;
+
+sub is_leap_year {
+    my $year = shift;
+    return 0 if $year % 4;   # not divisible by 4
+    return 1 if $year % 100; # divisible by 4, not by 100
+    return 0 if $year % 400; # divisible by 100, not by 400
+    return 1;                # divisible by 400
+}
+
+for my $year (1900..2100) {
+    my $date = timegm(0, 0, 0, 1, 0, $year);
+    my $day_in_week = (gmtime $date)[6];
+    print $year, ", " if $day_in_week == 4; # 4 = Thursday
+    print $year, ", " if $day_in_week == 3 and is_leap_year $year;
+}
+say "";
diff --git a/challenge-137/laurent-rosenfeld/perl/ch-2.pl b/challenge-137/laurent-rosenfeld/perl/ch-2.pl
new file mode 100644
index 0000000000..698e631f52
--- /dev/null
+++ b/challenge-137/laurent-rosenfeld/perl/ch-2.pl
@@ -0,0 +1,19 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use feature qw/say/;
+
+sub is_lychrel {
+    my $m = shift;
+    my $n = $m;
+    for my $i (1..500) {
+        return "$m is a Lychrel candidate. Reached the 1e7 limit"
+            if $n > 10_000_000;
+        $n += reverse $n;
+        return 0 if $n == reverse $n;
+    }
+    return "$m is a lychrel candidate (made 500 iterations)";
+}
+for my $test (10..20, 30, 50, 100, 196) {
+    say "$test -> ", is_lychrel $test;
+}
diff --git a/challenge-137/laurent-rosenfeld/raku/ch-1.raku b/challenge-137/laurent-rosenfeld/raku/ch-1.raku
new file mode 100644
index 0000000000..c1fd4311e5
--- /dev/null
+++ b/challenge-137/laurent-rosenfeld/raku/ch-1.raku
@@ -0,0 +1,9 @@
+use v6;
+
+for 1900..2100 -> $y {
+    my $year = DateTime.new(:year($y));
+    my $new-year-day = Date.new("$y-01-01").day-of-week;
+    print "$y, " if $new-year-day == 4; # DoW 4 = Thursday
+    print "$y, " if $year.is-leap-year and $new-year-day == 3;
+}
+say "";
diff --git a/challenge-137/laurent-rosenfeld/raku/ch-2.raku b/challenge-137/laurent-rosenfeld/raku/ch-2.raku
new file mode 100644
index 0000000000..97e2c89ba1
--- /dev/null
+++ b/challenge-137/laurent-rosenfeld/raku/ch-2.raku
@@ -0,0 +1,15 @@
+use v6;
+
+sub is-lychrel (UInt $m) {
+    my $n = $m;
+    for 1..500 -> $i {
+        return "$m is a Lychrel candidate. Reached the 1e7 limit"
+            if $n > 10_000_000;
+        $n += $n.flip;
+        #`[say $n and] return 0 if $n == $n.flip;
+    }
+    return "$m is a lychrel candidate (made 500 iterations)";
+}
+for 10...20, 30, 50, 100, 196 -> $test {
+    say "$test -> ", is-lychrel $test;
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index ecfc7671a1..52e4950231 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,113 +1,4 @@
 {
-   "legend" : {
-      "enabled" : 0
-   },
-   "series" : [
-      {
-         "name" : "The Weekly Challenge - 137",
-         "data" : [
-            {
-               "name" : "Andrew Shitov",
-               "drilldown" : "Andrew Shitov",
-               "y" : 1
-            },
-            {
-               "name" : "Bob Lied",
-               "drilldown" : "Bob Lied",
-               "y" : 2
-            },
-            {
-               "y" : 6,
-               "drilldown" : "Flavio Poletti",
-               "name" : "Flavio Poletti"
-            },
-            {
-               "name" : "James Smith",
-               "drilldown" : "James Smith",
-               "y" : 3
-            },
-            {
-               "drilldown" : "Luca Ferrari",
-               "y" : 6,
-               "name" : "Luca Ferrari"
-            },
-            {
-               "name" : "Mark Anderson",
-               "drilldown" : "Mark Anderson",
-               "y" : 2
-            },
-            {
-               "name" : "Matthew Neleigh",
-               "y" : 2,
-               "drilldown" : "Matthew Neleigh"
-            },
-            {
-               "name" : "Niels van Dijke",
-               "drilldown" : "Niels van Dijke",
-               "y" : 2
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Paulo Custodio",
-               "name" : "Paulo Custodio"
-            },
-            {
-               "name" : "Robert DiCicco",
-               "y" : 1,
-               "drilldown" : "Robert DiCicco"
-            },
-            {
-               "name" : "Roger Bell_West",
-               "y" : 4,
-               "drilldown" : "Roger Bell_West"
-            },
-            {
-               "name" : "Simon Green",
-               "drilldown" : "Simon Green",
-               "y" : 3
-            },
-            {
-               "name" : "Steven Wilson",
-               "y" : 2,
-               "drilldown" : "Steven Wilson"
-            },
-            {
-               "name" : "Ulrich Rieke",
-               "drilldown" : "Ulrich Rieke",
-               "y" : 4
-            },
-            {
-               "name" : "W. Luis Mochan",
-               "y" : 3,
-               "drilldown" : "W. Luis Mochan"
-            }
-         ],
-         "colorByPoint" : 1
-      }
-   ],
-   "chart" : {
-      "type" : "column"
-   },
-   "subtitle" : {
-      "text" : "[Champions: 15] Last updated at 2021-11-03 07:58:23 GMT"
-   },
-   "xAxis" : {
-      "type" : "category"
-   },
-   "tooltip" : {
-      "followPointer" : 1,
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>"
-   },
-   "plotOptions" : {
-      "series" : {
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         },
-         "borderWidth" : 0
-      }
-   },
    "drilldown" : {
       "series" : [
          {
@@ -122,16 +13,16 @@
          },
          {
             "id" : "Bob Lied",
-            "name" : "Bob Lied",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Bob Lied"
          },
          {
-            "id" : "Flavio Poletti",
+            "name" : "Flavio Poletti",
             "data" : [
                [
                   "Perl",
@@ -146,7 +37,7 @@
                   2
                ]
             ],
-            "name" : "Flavio Poletti"
+            "id" : "Flavio Poletti"
          },
          {
             "name" : "James Smith",
@@ -163,8 +54,24 @@
             "id" : "James Smith"
          },
          {
-            "id" : "Luca Ferrari",
-            "name" : "Luca Ferrari",
+            "id" : "Laurent Rosenfeld",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Laurent Rosenfeld"
+         },
+         {
             "data" : [
                [
                   "Raku",
@@ -174,21 +81,23 @@
                   "Blog",
                   4
                ]
-            ]
+            ],
+            "id" : "Luca Ferrari",
+            "name" : "Luca Ferrari"
          },
          {
-            "id" : "Mark Anderson",
+            "name" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "name" : "Mark Anderson"
+            "id" : "Mark Anderson"
          },
          {
-            "id" : "Matthew Neleigh",
             "name" : "Matthew Neleigh",
+            "id" : "Matthew Neleigh",
             "data" : [
                [
                   "Perl",
@@ -197,8 +106,8 @@
             ]
          },
          {
-            "id" : "Niels van Dijke",
             "name" : "Niels van Dijke",
+            "id" : "Niels van Dijke",
             "data" : [
                [
                   "Perl",
@@ -207,27 +116,26 @@
             ]
          },
          {
-            "id" : "Paulo Custodio",
-            "name" : "Paulo Custodio",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "Paulo Custodio",
+            "name" : "Paulo Custodio"
          },
          {
+            "name" : "Robert DiCicco",
+            "id" : "Robert DiCicco",
             "data" : [
                [
                   "Perl",
                   1
                ]
-            ],
-            "name" : "Robert DiCicco",
-            "id" : "Robert DiCicco"
+            ]
          },
          {
-            "id" : "Roger Bell_West",
             "name" : "Roger Bell_West",
             "data" : [
                [
@@ -238,11 +146,10 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "id" : "Roger Bell_West"
          },
          {
-            "id" : "Simon Green",
-            "name" : "Simon Green",
             "data" : [
                [
                   "Perl",
@@ -252,17 +159,19 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Simon Green",
+            "name" : "Simon Green"
          },
          {
-            "name" : "Steven Wilson",
+            "id" : "Steven Wilson",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "Steven Wilson"
+            "name" : "Steven Wilson"
          },
          {
             "id" : "Ulrich Rieke",
@@ -289,11 +198,125 @@
                   1
                ]
             ],
-            "name" : "W. Luis Mochan",
-            "id" : "W. Luis Mochan"
+            "id" : "W. Luis Mochan",
+            "name" : "W. Luis Mochan"
          }
       ]
    },
+   "legend" : {
+      "enabled" : 0
+   },
+   "tooltip" : {
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
+      "followPointer" : 1
+   },
+   "subtitle" : {
+      "text" : "[Champions: 16] Last updated at 2021-11-03 08:20:46 GMT"
+   },
+   "chart" : {
+      "type" : "column"
+   },
+   "series" : [
+      {
+         "colorByPoint" : 1,
+         "data" : [
+            {
+               "y" : 1,
+               "drilldown" : "Andrew Shitov",
+               "name" : "Andrew Shitov"
+            },
+            {
+               "name" : "Bob Lied",
+               "drilldown" : "Bob Lied",
+               "y" : 2
+            },
+            {
+               "y" : 6,
+               "drilldown" : "Flavio Poletti",
+               "name" : "Flavio Poletti"
+            },
+            {
+               "y" : 3,
+               "drilldown" : "James Smith",
+               "name" : "James Smith"
+            },
+            {
+               "name" : "Laurent Rosenfeld",
+               "drilldown" : "Laurent Rosenfeld",
+               "y" : 5
+            },
+            {
+               "y" : 6,
+               "drilldown" : "Luca Ferrari",
+               "name" : "Luca Ferrari"
+            },
+            {
+               "drilldown" : "Mark Anderson",
+               "name" : "Mark Anderson",
+               "y" : 2
+            },
+            {
+               "name" : "Matthew Neleigh",
+               "drilldown" : "Matthew Neleigh",
+               "y" : 2
+            },
+            {
+               "y" : 2,
+               "name" : "Niels van Dijke",
+               "drilldown" : "Niels van Dijke"
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Paulo Custodio",
+               "name" : "Paulo Custodio"
+            },
+            {
+               "y" : 1,
+               "name" : "Robert DiCicco",
+               "drilldown" : "Robert DiCicco"
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West"
+            },
+            {
+               "name" : "Simon Green",
+               "drilldown" : "Simon Green",
+               "y" : 3
+            },
+            {
+               "y" : 2,
+               "name" : "Steven Wilson",
+               "drilldown" : "Steven Wilson"
+            },
+            {
+               "name" : "Ulrich Rieke",
+               "drilldown" : "Ulrich Rieke",
+               "y" : 4
+            },
+            {
+               "y" : 3,
+               "name" : "W. Luis Mochan",
+               "drilldown" : "W. Luis Mochan"
+            }
+         ],
+         "name" : "The Weekly Challenge - 137"
+      }
+   ],
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
+      }
+   },
+   "xAxis" : {
+      "type" : "category"
+   },
    "title" : {
       "text" : "The Weekly Challenge - 137"
    },
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 1dd32a41c6..f16686196b 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,13 +1,4 @@
 {
-   "title" : {
-      "text" : "The Weekly Challenge Contributions [2019 - 2021]"
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : null
-      },
-      "min" : 0
-   },
    "xAxis" : {
       "type" : "category",
       "labels" : {
@@ -17,46 +8,55 @@
          }
       }
    },
+   "yAxis" : {
+      "min" : 0,
+      "title" : {
+         "text" : null
+      }
+   },
+   "title" : {
+      "text" : "The Weekly Challenge Contributions [2019 - 2021]"
+   },
+   "legend" : {
+      "enabled" : "false"
+   },
    "tooltip" : {
       "pointFormat" : "<b>{point.y:.0f}</b>"
    },
+   "subtitle" : {
+      "text" : "Last updated at 2021-11-03 08:20:46 GMT"
+   },
    "series" : [
       {
-         "dataLabels" : {
-            "style" : {
-               "fontSize" : "13px",
-               "fontFamily" : "Verdana, sans-serif"
-            },
-            "rotation" : -90,
-            "enabled" : "true",
-            "y" : 10,
-            "format" : "{point.y:.0f}",
-            "align" : "right",
-            "color" : "#FFFFFF"
-         },
-         "name" : "Contributions",
          "data" : [
             [
                "Blog",
-               1988
+               1989
             ],
             [
                "Perl",
-               6554
+               6556
             ],
             [
                "Raku",
-               3979
+               3981
             ]
-         ]
+         ],
+         "dataLabels" : {
+            "color" : "#FFFFFF",
+            "style" : {
+               "fontSize" : "13px",
+               "fontFamily" : "Verdana, sans-serif"
+            },
+            "format" : "{point.y:.0f}",
+            "rotation" : -90,
+            "align" : "right",
+            "y" : 10,
+            "enabled" : "true"
+         },
+         "name" : "Contributions"
       }
    ],
-   "legend" : {
-      "enabled" : "false"
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2021-11-03 07:58:23 GMT"
-   },
    "chart" : {
       "type" : "column"
    }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 4f71afcc67..4e98601dee 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,15 +1,22 @@
 {
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "title" : {
+      "text" : "The Weekly Challenge Language"
+   },
    "xAxis" : {
       "type" : "category"
    },
-   "tooltip" : {
-      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
-      "followPointer" : "true",
-      "headerFormat" : "<span style=\"font-size:11px\"></span>"
+   "legend" : {
+      "enabled" : "false"
    },
    "drilldown" : {
       "series" : [
          {
+            "name" : "001",
             "data" : [
                [
                   "Perl",
@@ -24,11 +31,9 @@
                   11
                ]
             ],
-            "name" : "001",
             "id" : "001"
          },
          {
-            "name" : "002",
             "data" : [
                [
                   "Perl",
@@ -43,7 +48,8 @@
                   10
                ]
             ],
-            "id" : "002"
+            "id" : "002",
+            "name" : "002"
          },
          {
             "data" : [
@@ -60,10 +66,11 @@
                   9
                ]
             ],
-            "name" : "003",
-            "id" : "003"
+            "id" : "003",
+            "name" : "003"
          },
          {
+            "id" : "004",
             "data" : [
                [
                   "Perl",
@@ -78,10 +85,11 @@
                   10
                ]
             ],
-            "name" : "004",
-            "id" : "004"
+            "name" : "004"
          },
          {
+            "name" : "005",
+            "id" : "005",
             "data" : [
                [
                   "Perl",
@@ -95,11 +103,10 @@
                   "Blog",
                   12
                ]
-            ],
-            "name" : "005",
-            "id" : "005"
+            ]
          },
          {
+            "name" : "006",
             "id" : "006",
             "data" : [
                [
@@ -114,10 +121,10 @@
                   "Blog",
                   7
                ]
-            ],
-            "name" : "006"
+            ]
          },
          {
+            "name" : "007",
             "id" : "007",
             "data" : [
                [
@@ -132,11 +139,9 @@
                   "Blog",
                   10
                ]
-            ],
-            "name" : "007"
+            ]
          },
          {
-            "id" : "008",
             "data" : [
                [
                   "Perl",
@@ -151,10 +156,10 @@
                   12
                ]
             ],
+            "id" : "008",
             "name" : "008"
          },
          {
-            "id" : "009",
             "data" : [
                [
                   "Perl",
@@ -169,11 +174,11 @@
                   13
                ]
             ],
+            "id" : "009",
             "name" : "009"
          },
          {
             "id" : "010",
-            "name" : "010",
             "data" : [
                [
                   "Perl",
@@ -187,7 +192,8 @@
                   "Blog",
                   11
                ]
-            ]
+            ],
+            "name" : "010"
          },
          {
             "data" : [
@@ -204,11 +210,11 @@
                   10
                ]
             ],
-            "name" : "011",
-            "id" : "011"
+            "id" : "011",
+            "name" : "011"
          },
          {
-            "name" : "012",
+            "id" : "012",
             "data" : [
                [
                   "Perl",
@@ -223,11 +229,10 @@
                   11
                ]
             ],
-            "id" : "012"
+            "name" : "012"
          },
          {
             "id" : "013",
-            "name" : "013",
             "data" : [
                [
                   "Perl",
@@ -241,11 +246,11 @@
                   "Blog",
                   13
                ]
-            ]
+            ],
+            "name" : "013"
          },
          {
             "id" : "014",
-            "name" : "014",
             "data" : [
                [
                   "Perl",
@@ -259,9 +264,11 @@
                   "Blog",
                   15
                ]
-            ]
+            ],
+            "name" : "014"
          },
          {
+            "name" : "015",
             "id" : "015",
             "data" : [
                [
@@ -276,11 +283,11 @@
                   "Blog",
                   15
                ]
-            ],
-            "name" : "015"
+            ]
          },
          {
             "name" : "016",
+            "id" : "016",
             "data" : [
                [
                   "Perl",
@@ -294,11 +301,9 @@
                   "Blog",
                   12
                ]
-            ],
-            "id" : "016"
+            ]
          },
          {
-            "name" : "017",
             "data" : [
                [
                   "Perl",
@@ -313,11 +318,12 @@
                   12
                ]
             ],
-            "id" : "017"
+            "id" : "017",
+            "name" : "017"
          },
          {
-            "id" : "018",
             "name" : "018",
+            "id" : "018",
             "data" : [
                [
                   "Perl",
@@ -352,8 +358,6 @@
             "id" : "019"
          },
          {
-            "id" : "020",
-            "name" : "020",
             "data" : [
                [
                   "Perl",
@@ -367,10 +371,12 @@
                   "Blog",
                   13
                ]
-            ]
+            ],
+            "id" : "020",
+            "name" : "020"
          },
          {
-            "name" : "021",
+            "id" : "021",
             "data" : [
                [
                   "Perl",
@@ -385,9 +391,11 @@
                   10
                ]
             ],
-            "id" : "021"
+            "name" : "021"
          },
          {
+            "name" : "022",
+            "id" : "022",
             "data" : [
                [
                   "Perl",
@@ -401,13 +409,9 @@
                   "Blog",
                   10
                ]
-            ],
-            "name" : "022",
-            "id" : "022"
+            ]
          },
          {
-            "id" : "023",
-            "name" : "023",
             "data" : [
                [
                   "Perl",
@@ -421,10 +425,11 @@
                   "Blog",
                   12
                ]
-            ]
+            ],
+            "id" : "023",
+            "name" : "023"
          },
          {
-            "name" : "024",
             "data" : [
                [
                   "Perl",
@@ -439,9 +444,11 @@
                   11
                ]
             ],
-            "id" : "024"
+            "id" : "024",
+            "name" : "024"
          },
          {
+            "name" : "025",
             "data" : [
                [
                   "Perl",
@@ -456,10 +463,10 @@
                   12
                ]
             ],
-            "name" : "025",
             "id" : "025"
          },
          {
+            "id" : "026",
             "data" : [
                [
                   "Perl",
@@ -474,8 +481,7 @@
                   10
                ]
             ],
-            "name" : "026",
-            "id" : "026"
+            "name" : "026"
          },
          {
             "name" : "027",
@@ -496,7 +502,6 @@
             "id" : "027"
          },
          {
-            "name" : "028",
             "data" : [
                [
                   "Perl",
@@ -511,10 +516,11 @@
                   9
                ]
             ],
-            "id" : "028"
+            "id" : "028",
+            "name" : "028"
          },
          {
-            "name" : "029",
+            "id" : "029",
             "data" : [
                [
                   "Perl",
@@ -529,7 +535,7 @@
                   12
                ]
             ],
-            "id" : "029"
+            "name" : "029"
          },
          {
             "id" : "030",
@@ -550,8 +556,6 @@
             "name" : "030"
          },
          {
-            "id" : "031",
-            "name" : "031",
             "data" : [
                [
                   "Perl",
@@ -565,10 +569,11 @@
                   "Blog",
                   9
                ]
-            ]
+            ],
+            "id" : "031",
+            "name" : "031"
          },
          {
-            "id" : "032",
             "name" : "032",
             "data" : [
                [
@@ -583,11 +588,12 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "id" : "032"
          },
          {
-            "id" : "033",
             "name" : "033",
+            "id" : "033",
             "data" : [
                [
                   "Perl",
@@ -604,6 +610,7 @@
             ]
          },
          {
+            "id" : "034",
             "data" : [
                [
                   "Perl",
@@ -618,8 +625,7 @@
                   11
                ]
             ],
-            "name" : "034",
-            "id" : "034"
+            "name" : "034"
          },
          {
             "id" : "035",
@@ -640,6 +646,8 @@
             "name" : "035"
          },
          {
+            "name" : "036",
+            "id" : "036",
             "data" : [
                [
                   "Perl",
@@ -653,12 +661,9 @@
                   "Blog",
                   11
                ]
-            ],
-            "name" : "036",
-            "id" : "036"
+            ]
          },