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%I #16 May 07 2024 14:53:36
%S 3,7,13,1093
%N Numbers greater than 1 whose square divide 2^1092-1.
%C Up to now only two primes p such that p^2 divides 2^(p-1)-1 are known (these two are Wieferich primes, see A001220).
%e From _Reinhard Zumkeller_, May 14 2010: (Start)
%e a(1)^2 = 9 = A177855(5);
%e a(2)^2 = 49 = A177855(14);
%e a(3)^2 = 169 = A177855(30);
%e a(4)^2 = 1194649 = A177855(1843). (End)
%Y Cf. A001220, A172290.
%K nonn,fini,full
%O 1,1
%A _Artur Jasinski_, Jan 30 2010
%E Keyword full added by _Reinhard Zumkeller_, May 14 2010
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