Mark Dickinson <dicki...@gmail.com> added the comment:

No, I mean 61.  2**61 - 1 is prime;  2**63-1 is not.  (So 2 bits of the hash 
get wasted, but that's not a big deal, especially since they're the high-end 
bits and Python mostly cares about the lower-order bits.)

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<http://bugs.python.org/issue8188>
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