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On Mon, May 7, 2012 at 12:35 PM, Mark Dickinson wrote:
will almost always be one less than a power of 2 and powers of 2 are always congruent to 1, 2 or 4 modulo 5, we're safe.
Bah. That should have read "1, 2, 3 or 4 modulo 5".
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