Thread: Divisible by 7
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Old 2007-05-14, 07:44   #3
xilman
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May 2003
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Quote:
Originally Posted by akruppa View Post
Iirc, Paul Leyland has something to say about the more general question.

Alex
Indeed. http://www.leyland.vispa.com/numth/primes/xyyx.htm is where it's at.

Note that site badly needs updating with more results sent to me relatively recently.


Paul
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