Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
1,2
a(n) = (p(n) + 1) if n is prime.
Table of n, a(n) for n=1..14.
Row sums of triangle A158906.
a(n) = 6 = (4 + 1 + 0, + 1).
A158906
Sequence in context: A230300 A162625 A033095 * A175708 A023830 A063649
Adjacent sequences: A158904 A158905 A158906 * A158908 A158909 A158910
nonn
Gary W. Adamson & Mats Granvik, Mar 29 2009
approved