Search: id:A126197
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%I A126197
%S A126197 11,1093,1093,3511,3511,5557,104891
%N A126197 GCD's arising in A126196.
%C A126197 All terms are primes. Note a connection to the Wieferich primes A001220(n) 
               = {1093, 3511} = primes p such that p^2 divides 2^(p-1) - 1. a(2) 
               = a(3) = 1093. a(3) = a(4) = 3511.
%Y A126197 Cf. A126196, A001008 and A125581.
%Y A126197 Cf. A126196. Cf. A125581 = numbers n such that n does not divide the 
               denominator of the n-th harmonic number nor the denominator of the 
               n-th alternating harmonic number. Cf. A001220 = Wieferich primes 
               p: p^2 divides 2^(p-1) - 1. Cf. A001008, A002805 = Denominator of 
               the n-th harmonic number. Cf. A058313, A058312 = Denominator of the 
               n-th alternating harmonic number. Cf. A074791 = numbers n such that 
               n does not divide the denominator of the n-th harmonic number. Cf. 
               A121594 = numbers n such that n does not divide the denominator of 
               the n-th alternating harmonic number.
%Y A126197 Sequence in context: A069710 A046187 A004811 this_sequence A090814 A153435 
               A109217
%Y A126197 Adjacent sequences: A126194 A126195 A126196 this_sequence A126198 A126199 
               A126200
%K A126197 nonn
%O A126197 1,1
%A A126197 Max Alekseyev and Tanya Khovanova, Mar 07 2007

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