If I read it correctly, you currently make a sieve of length 2 * range, centred around pmax. I think you need the length to be around 2 * (range + pmax - 1).

I don't understand the logic you're using with $max_pos to decide where in the sieve to match, and I'm not sure it's correct. But I'd be tempted to punt on that - make both sieve and input into strings as below, and use a regexp match.

  use List::Util qw{min};
  my @order = '0' .. '9', 'A' .. 'Z'; # range of 2^36 is probably enou
+gh

  sub to_string {
    my($max, $list) = @_;
    return join '', map {
      defined($_) ? $order[min($_, $max)] : '.'
    } @$list;
  }

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In reply to Re^8: checking a set of numbers for consistency mod p (update: still buggy) by hv
in thread checking a set of numbers for consistency mod p by hv

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