Practical numbers: Difference between revisions
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STRETCH GOAL: 666 is Practical.</pre>
=={{header|Raku}}==
<lang perl6>use Prime::Factor:ver<0.3.0+>;
sub is-practical ($n) {
my @proper = $n.&proper-divisors.combinations».sum.unique.sort;
+@proper < $n-1 ?? False !! @proper[^$n] eqv (^$n).list ?? True !! False
}
say "{+$_} matching numbers:\n{.batch(10)».fmt('%3d').join: "\n"}"
given [ (1..333).hyper(:32batch).grep: { is-practical($_) } ];
say "\n666 is practical? ", is-practical 666;</lang>
{{out}}
<pre>77 matching numbers:
1 2 4 6 8 12 16 18 20 24
28 30 32 36 40 42 48 54 56 60
64 66 72 78 80 84 88 90 96 100
104 108 112 120 126 128 132 140 144 150
156 160 162 168 176 180 192 196 198 200
204 208 210 216 220 224 228 234 240 252
256 260 264 270 272 276 280 288 294 300
304 306 308 312 320 324 330
666 is practical? True</pre>
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