%I #5 Dec 05 2013 19:56:17

%S 1,3,11,9,29,18,59,28,40,54,107,69,179,87,106,125,271,147,389,172,200,

%T 224,541,254,286,316,346,381,727,416,941,455,495,534,575,620,1201,665,

%U 710,756,1493,804,1823,856,909,962,2203,1018,1077,1136,1194,1254,2621

%N Main diagonal of triangle A084408.

%C a(n) is prime iff n is prime.

%F For n prime, a(n) = p(A034387(n)). For n composite, a(n) = A002808([n*(n+1)/2]-A034387(n)-1).

%Y Cf. A084408, A084410, A084411.

%K nonn,easy

%O 1,2

%A _Amarnath Murthy_, Jun 01 2003

%E Edited and extended by _David Wasserman_, Dec 27 2004