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Old 2013-05-12, 21:41   #7
Batalov
 
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Mar 2008
Phi(4,2^7658614+1)/2

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Yes, indeed. There was a P.Euler problem in similar vein. (more than one, actually)

Can we count the number of (distinct) solutions of OP?
(with d1 < d2 < ... < dn < 10001)
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