Search: id:A129296
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%I A129296
%S A129296 1,1,2,2,4,2,5,3,5,3,8,2,8,4,6,4,9,2,12,4,8,4,10,3,10,6,8,4,16,2,14,4,
               7,
%T A129296 8,12,4,12,4,10,4,20,2,16,6,8,6,12,3,18,6,12,4,16,4,20,8,10,4,16,2,16,
               6,
%U A129296 8,12,16,4,16,4,16,4,30,2,15,6,8,12,16,4,24,5,12,5,16,4,16,8,10,4,30,4
%N A129296 Number of divisors of n^2 - 1 that are not greater than n.
%C A129296 a(n) = #{d: d<=n and A005563(n+1) mod d = 0};
%C A129296 a(n)>1 for n>2, see A129297 for m such that a(m)=2: a(A129297(n))=2.
%H A129296 R. Zumkeller, <a href="b129296.txt">Table of n, a(n) for n = 1..10000</
               a>
%e A129296 a(100) = #{1,3,9,11,33,99} = 6.
%Y A129296 Cf. A129292, A129294.
%Y A129296 Sequence in context: A056148 A057567 A005128 this_sequence A125296 A121895 
               A139555
%Y A129296 Adjacent sequences: A129293 A129294 A129295 this_sequence A129297 A129298 
               A129299
%K A129296 nonn
%O A129296 1,3
%A A129296 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Apr 09 2007

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