I don't mind the departure in how you call the generating function but I'm going to disqualify this one for having the closure return "50101" instead of 0 and "51100" instead of 1.

If you were shifting the other direction, then a simple &1 at the end of the closure would solve the problem and give you a 73-character solution (not counting the "sub l{" and "}", as usual).

I'm sure this general approach can be modified such that I'd accept it but I'll leave that to you or whoever beats you to it. (:

        - tye (but my friends call me "Tye")

In reply to 73 chars, called on a foul (Re: LFSR golf) by tye
in thread LFSR golf by tye

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