Practical numbers: Difference between revisions

=={{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>