Search: id:A117531
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%I A117531
%S A117531 1,2,3,3,5,3,7,3,5,6,6,6,13,3,11,8,12,8,13,10,8,7,12,10,9,21,6,22,11,7,
%T A117531 13,12,21,13,14,16,18,7,20,17,21,20,24,14,18,20,16,16,35,10,18,29,18,30,
%U A117531 30,26,21,18,21,29,16,22,32,40,10,27,24,25,45,18,39,40,43,11,11
%N A117531 Number of primes in the n-th row of the triangle in A117530.
%C A117531 1 <= a(n) <= n; conjecture: a(n) < n for n>13.
%F A117531 a(n) = Sum(A010051(A117530(n,k)): 1 <= k <= n).
%Y A117531 Sequence in context: A071049 A140187 A111607 this_sequence A105555 A066858 
               A152864
%Y A117531 Adjacent sequences: A117528 A117529 A117530 this_sequence A117532 A117533 
               A117534
%K A117531 nonn
%O A117531 1,2
%A A117531 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 25 2006

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