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  1. or download this
    #!/usr/bin/env perl
use strict;
...
printf "Collatz(%5d) has sequence length of %3d steps\n", @$_
    for @seqs;
  2. or download this
    #!/usr/bin/env perl
use strict;
...
printf "Collatz(%5d) has sequence length of %3d steps\n", @$_
    for @seqs;
  3. or download this
    1e9, 32 cores
  collatz_seq_before     0m34.211s
...
Collatz(906355587) has sequence length of 959 steps
Collatz(906355588) has sequence length of 959 steps