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%I
%S 5,491531
%N Primes p such that p^2 divides 7^(p-1) - 1.
%C Dorais and Klyve proved that there are no further terms up to 9.7*10^14.
%H F. G. Dorais and D. Klyve, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL14/Klyve/klyve3.pdf">A Wieferich prime search up to p < 6.7*10^15</a>, J. Integer Seq. 14 (2011), Art. 11.9.2, 1-14.
%H W. Keller and J. Richstein, <a href="http://www1.uni-hamburg.de/RRZ/W.Keller/FermatQuotient.html">Fermat quotients q_p(a) that are divisible by p</a>.
%Y Cf. A001220, A014127, A123692, A123693, A128667, A128668, A090968, A039951, A128669
%K bref,hard,nonn,more
%O 1,1
%A _Max Alekseyev_, Oct 07 2006
%E Updated by _Max Alekseyev_, Jan 29 2012
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