From fc3110bcee6d1c983f4f7458b9cc82710f000ee8 Mon Sep 17 00:00:00 2001
From: arnesom <arne@bbop.org>
Date: Mon, 6 Jun 2022 01:07:53 +0200
Subject: Arne Sommer

---
 challenge-167/arne-sommer/blog.txt                 |  1 +
 challenge-167/arne-sommer/raku/ch-1.raku           | 28 ++++++++++++++++++++++
 challenge-167/arne-sommer/raku/ch-2.raku           |  7 ++++++
 challenge-167/arne-sommer/raku/circular-prime      | 28 ++++++++++++++++++++++
 .../arne-sommer/raku/circular-prime-stupid         |  3 +++
 challenge-167/arne-sommer/raku/gamma-function      |  7 ++++++
 challenge-167/arne-sommer/raku/gamma-function-int  |  7 ++++++
 7 files changed, 81 insertions(+)
 create mode 100644 challenge-167/arne-sommer/blog.txt
 create mode 100755 challenge-167/arne-sommer/raku/ch-1.raku
 create mode 100755 challenge-167/arne-sommer/raku/ch-2.raku
 create mode 100755 challenge-167/arne-sommer/raku/circular-prime
 create mode 100755 challenge-167/arne-sommer/raku/circular-prime-stupid
 create mode 100755 challenge-167/arne-sommer/raku/gamma-function
 create mode 100755 challenge-167/arne-sommer/raku/gamma-function-int

diff --git a/challenge-167/arne-sommer/blog.txt b/challenge-167/arne-sommer/blog.txt
new file mode 100644
index 0000000000..eadd654c4e
--- /dev/null
+++ b/challenge-167/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/primarily-functional.html
diff --git a/challenge-167/arne-sommer/raku/ch-1.raku b/challenge-167/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..22fd9ba03b
--- /dev/null
+++ b/challenge-167/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,28 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Int $c where $c > 1 = 10);
+
+my $cp := (100 .. *).grep({ is-circular($_) });
+
+sub is-circular ($number)
+{
+  state %seen;
+
+  return if %seen{$number}; %seen{$number} = True;
+
+  return unless $number ~~ /^<[1379]>+$/;
+  return unless $number.is-prime;
+
+  my @digits = $number.comb;
+
+  for (1 .. @digits.elems -1) -> $skew
+  {
+    my $rotated = @digits.rotate($skew).join;
+    return if %seen{$rotated};
+    return unless $rotated.is-prime;
+  }
+
+  return True;
+}
+
+say $cp[^$c].join(", ");
\ No newline at end of file
diff --git a/challenge-167/arne-sommer/raku/ch-2.raku b/challenge-167/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..a632486a8e
--- /dev/null
+++ b/challenge-167/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,7 @@
+#! /usr/bin/env raku
+
+use Math::Libgsl::Function :ALL;
+
+unit sub MAIN (Int :u(:$upto) where $upto > 0 = 10);
+
+say "$_ -> { gamma($_).Int }" for 1 .. $upto;
diff --git a/challenge-167/arne-sommer/raku/circular-prime b/challenge-167/arne-sommer/raku/circular-prime
new file mode 100755
index 0000000000..22fd9ba03b
--- /dev/null
+++ b/challenge-167/arne-sommer/raku/circular-prime
@@ -0,0 +1,28 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Int $c where $c > 1 = 10);
+
+my $cp := (100 .. *).grep({ is-circular($_) });
+
+sub is-circular ($number)
+{
+  state %seen;
+
+  return if %seen{$number}; %seen{$number} = True;
+
+  return unless $number ~~ /^<[1379]>+$/;
+  return unless $number.is-prime;
+
+  my @digits = $number.comb;
+
+  for (1 .. @digits.elems -1) -> $skew
+  {
+    my $rotated = @digits.rotate($skew).join;
+    return if %seen{$rotated};
+    return unless $rotated.is-prime;
+  }
+
+  return True;
+}
+
+say $cp[^$c].join(", ");
\ No newline at end of file
diff --git a/challenge-167/arne-sommer/raku/circular-prime-stupid b/challenge-167/arne-sommer/raku/circular-prime-stupid
new file mode 100755
index 0000000000..469bf9d164
--- /dev/null
+++ b/challenge-167/arne-sommer/raku/circular-prime-stupid
@@ -0,0 +1,3 @@
+#! /usr/bin/env raku
+
+say "113, 197, 199, 337, 1193, 3779, 11939, 19937, 193939, 199933";
diff --git a/challenge-167/arne-sommer/raku/gamma-function b/challenge-167/arne-sommer/raku/gamma-function
new file mode 100755
index 0000000000..8751524d9d
--- /dev/null
+++ b/challenge-167/arne-sommer/raku/gamma-function
@@ -0,0 +1,7 @@
+#! /usr/bin/env raku
+
+use Math::Libgsl::Function :ALL;
+
+unit sub MAIN (Int :u(:$upto) where $upto > 0 = 10);
+
+say "$_ -> { gamma($_) }" for 1 .. $upto;
diff --git a/challenge-167/arne-sommer/raku/gamma-function-int b/challenge-167/arne-sommer/raku/gamma-function-int
new file mode 100755
index 0000000000..a632486a8e
--- /dev/null
+++ b/challenge-167/arne-sommer/raku/gamma-function-int
@@ -0,0 +1,7 @@
+#! /usr/bin/env raku
+
+use Math::Libgsl::Function :ALL;
+
+unit sub MAIN (Int :u(:$upto) where $upto > 0 = 10);
+
+say "$_ -> { gamma($_).Int }" for 1 .. $upto;
-- 
cgit