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  1. or download this
    use strict;
use warnings;
...
say "Longest Collatz (index and value)";
say "$number $length";
  2. or download this
    1e7 : 8400511 685

...
    collatz_longest_c1       0m01.868s  Inline C code
    collatz_longest_c2       0m00.778s  Inline C code