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%I #6 Mar 06 2013 00:33:31
%S 2,1,2,4,2,6,6,2,6,2,6,14,4,12,6,2,4,4,2,2,6,6,2,4,6,8,6,16,6,4,6,6,6,
%T 6,6,6,14,6,6,14,10,10,8,4,12,20,8,12,6,10,2,6,14,2,14,18,6,2,6,12,4,
%U 28,6,20,6,6,6,4,16,2,2,6,4,12,6,6,6,6,8,4,6,8,6
%N Column 1 of A217916 (when formed into a number triangle).
%C The number 2 appears in A217916 only in column 1.
%C The positions of 2 are given by A217919.
%H Paul D. Hanna, <a href="/A217920/b217920.txt">Table of n, a(n) for n = 1..287</a>
%F a(n) = prime(n*(n-1)/2 + 1) - prime(n*(n-1)/2) for n>1 with a(1)=2.
%Y Cf. A217916, A217918, A217919.
%K nonn
%O 1,1
%A _Paul D. Hanna_, Mar 04 2013
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