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  1. or download this
    #!/usr/bin/env perl
use strict;
...
say "Longest Collatz (index and value)";
say "$number $length";
  2. or download this
    #!/usr/bin/env perl
use strict;
...
say "Longest Collatz (index and value)";
say "$number $length";
  3. or download this
    1e9, 32 cores
  collatz_longest_final      0m26.371s
...
Longest Collatz (index and value)
670617279 986