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Old 2014-05-29, 15:23   #3
R.D. Silverman
 
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Nov 2003

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Quote:
Originally Posted by CRGreathouse View Post
I suspect he checked only to 2^64 using Jan's list.

Probably there are others but searching seems futile.
On very rough probability grounds one might expect there to be
O(loglog N) examples up to N
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