133 JRaspass

$large² and ^∞ are fun uses of unicode imo.

2 files changed, 25 insertions, 0 deletions

diff --git a/challenge-133/james-raspass/raku/ch-1.raku b/challenge-133/james-raspass/raku/ch-1.raku
new file mode 100644
index 0000000000..769771a924
--- /dev/null
+++ b/challenge-133/james-raspass/raku/ch-1.raku
@@ -0,0 +1,9 @@
+sub MAIN(UInt $n) { say isqrt $n }
+
+multi sub isqrt(UInt:D $n where 0 | 1) { $n }
+multi sub isqrt(UInt:D $n) {
+    my $small = isqrt($n +> 2) +< 1;
+    my $large = $small + 1;
+
+    return $large² > $n ?? $small !! $large;
+}
diff --git a/challenge-133/james-raspass/raku/ch-2.raku b/challenge-133/james-raspass/raku/ch-2.raku
new file mode 100644
index 0000000000..99c9d6ea1c
--- /dev/null
+++ b/challenge-133/james-raspass/raku/ch-2.raku
@@ -0,0 +1,16 @@
+sub factors($n is copy) {
+    my constant @primes = grep &is-prime, ^∞;
+
+    my $i;
+    gather while $n > 1 {
+        next unless $n %% my $factor = @primes[$i++];
+
+        $i = 0;
+        $n /= take $factor;
+    }
+}
+
+multi is-smith (0) { False }
+multi is-smith { !$^n.is-prime && $n.comb.sum == factors($n).comb.sum }
+
+grep(&is-smith, ^∞)[^10].say;