How about 
sub l{my($s,$t)=@_;sub {($s=($s.(((my $x=$s+$t)=~y/1/1/d)%9%2)))=~s/5.
+/5/;$s}}
$x=l("50101","0022");print ($x->(),$x->(),$x->(),$x->());

[download]
The first line is the generating sub (containing 79 chars) and the second one is an usage example.

In reply to Re: LFSR golf by Anonymous Monk
in thread LFSR golf by tye

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