Try to find a number that takes more than eleven steps.

use v5.10;
use strict;
use warnings;
use List::Util qw(product);

sub per {
    my ($n) = @_;
    return if $n < 10;
    my $p = product split //, $n;
    return $p, per($p);
}

my @steps = per 277777788888899;
my $steps = @steps;

say "$steps steps";
say for @steps;

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toby döt ink

In reply to Multiplication digit persistence by tobyink

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