Arggh, I went to fix a bug and accidentally deleted the whole post.
No need for modules
use strict;
use warnings;
my $limit = 987654321;
my $magic_num = 9 * 8 * 7;
my $max = int ($limit / $magic_num);
my $start = $max * $magic_num;
for (0..$max - 1){
my $num = $start - $magic_num * $_;
next if $num =~ /[05]/;
next if $num =~ /(.).*\1/;
die "$num\n"
}
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