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#!/usr/bin/env perl
use strict;
...
printf "Collatz(%5d) has sequence length of %3d steps\n", @$_
    for @seqs;

#!/usr/bin/env perl
use strict;
...
printf "Collatz(%5d) has sequence length of %3d steps\n", @$_
    for @seqs;

$ time perl collatz3_a.pl 1e7

...
Collatz(8397953) has sequence length of 593 steps
Collatz(6298465) has sequence length of 590 steps