I'm familiar with assigning to slices of a hash, and its use in this line:

@seen {$t, $h, $r, $e} = ();

was very clever. However, why did you use slices in these lines?

@seen {$n,} = ();
....
@seen {$o,} = ();

[download]
Aren't they equivalent to:
$seen{$n} = undef;
$seen{$o} = undef;

[download]
Or even just:
@seen {$n} = ();  # note the lack of comma after $n
....
@seen {$o} = ();

[download]
I guess its that trailing comma that looks odd to me.

-Blake
p.s. props on the @HIGH and @LOW generation... very sneaky!

In reply to Re: Re: (Efficiency Golf) Triangular numbers by blakem
in thread (Efficiency Golf) Triangular numbers by jepri

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