Ah, I should think a bit more before submitting. Here is
a 44 (and I should also mention it only works for smallish natural numbers, all different and at least 2 arguments):
sub nn{$a|=2x$_.3for@_;$b.=2until$a=~/3$b(3)/;@a=@-}
The need for the assign is a perlbug, otherwise it would be 41
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