%I #3 Mar 30 2012 18:50:47
%S 1,2,3,2,5,1,7,8,9,1,11,1,13,2,5,8,17,9,19,1,7,2,23,4,25,1,27,2,29,1,
%T 31,32,11,1,7,3,37,1,13,20,41,3,43,2,3,1,47,16,49,25,51,1,53,9,11,8,
%U 19,1,59,1,61,2,9,32,65,1,67,1,23,7,71,36,73,1,25,2,11,1,79,16,81,1,83,7,17
%N Right edge of triangle A098666.
%C a(n) = A098666(n,n);
%C a(n) = n iff n=1 or n is prime.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Sep 20 2004