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%I #7 Mar 06 2013 00:31:18
%S 1,4,11,29,46,121,172,191,254,1276,1432,1654,2416,2486,5254,9181,9592,
%T 10012,10441,11629,12881,14029,14197,16472,20707,22367,23872,24532,
%U 24977,26336,26797,27496,28681,29162,37951,38227,40756
%N Positions of 2 in sequence A217916.
%F Involves triangular-indexed twin primes:
%F prime(a(n)) - prime(a(n)-1) = 2 for n>1 with a(1)=1.
%Y Cf. A217916, A217919.
%K nonn
%O 1,2
%A _Paul D. Hanna_, Mar 04 2013
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