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%I #5 Dec 05 2013 19:56:17
%S 1,2,5,4,13,10,31,20,30,42,61,55,109,70,88,108,181,126,277,148,174,
%T 201,397,225,255,287,318,348,547,382,733,417,456,496,535,576,947,621,
%U 666,711,1213,758,1499,805,858,910,1831,963,1020,1078,1137,1195,2207,1255
%N First column of triangle A084408.
%C a(n) is prime iff n is prime.
%F For n prime, a(n) = p(A034387(n)-n+1). For n composite, a(n) = A002808([n*(n+1)/2]-A034387(n)-n).
%Y Cf. A084408, A084409, A084411.
%K nonn,easy
%O 1,2
%A _Amarnath Murthy_, Jun 01 2003
%E Edited and extended by _David Wasserman_, Dec 27 2004
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