Practical numbers: Difference between revisions
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→{{header|Raku}}: Better variable name, stretchy
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sub is-practical ($n) {
my @proper-sums = $n.&proper-divisors.combinations».sum.unique.sort;
+@proper-sums < $n-1 ?? False !! @proper-sums[^$n] eqv (^$n).list ?? True !! False
}
say "{+$_} matching numbers:\n{.batch(10)».fmt('%3d').join: "\n"}\n"
given [ (1..333).hyper(:32batch).grep: { is-practical($_) } ];
say "
say " 6666 is practical? ", is-practical 6666;
say "66666 is practical? ", is-practical 66666;</lang>
{{out}}
<pre>77 matching numbers:
Line 105 ⟶ 107:
304 306 308 312 320 324 330
666 is practical? True
6666 is practical? True
66666 is practical? False</pre>
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