A117531 - OEIS

%I #3 Mar 30 2012 18:50:54

%S 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,

%T 7,13,12,21,13,14,16,18,7,20,17,21,20,24,14,18,20,16,16,35,10,18,29,

%U 18,30,30,26,21,18,21,29,16,22,32,40,10,27,24,25,45,18,39,40,43,11,11

%N Number of primes in the n-th row of the triangle in A117530.

%C 1 <= a(n) <= n; conjecture: a(n) < n for n>13.

%F a(n) = Sum(A010051(A117530(n,k)): 1 <= k <= n).

%K nonn

%O 1,2

%A _Reinhard Zumkeller_, Mar 25 2006