What a neat solution! Leaner even than the bitwise solution (even
with that 0: , ... on there). Impressive. Please record it on the
wiki.
-Dan
PS: I cannot reproduce your timings:
NB. Work computer
1000 ts 'GC1 15'
0.00137394 525312
1000 ts 'GC3 15'
0.00252186 1.05299e6
1000 ts 'GC6 15'
0.000665091 787264
NB. Home computer
1000 ts 'GC1 15'
0.00102192 525312
1000 ts 'GC3 15'
0.00233702 1.05299e6
1000 ts 'GC6 15'
0.000322889 787264
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