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%I #9 Sep 06 2012 19:33:53
%S 2,6,8,14,18,20,26,30,36,44,48,50,54,56,68,74,78,86,90,96,98,114,116,
%T 120,128,134,138,140,146,156,158,168,174,176,186,194,198,200,204,210,
%U 216,224,228,230,254,260,270,278,284,288,296,300,306,308,320,326,330
%N Even n such that 2n+1 is prime.
%C If q = 2*n + 1 is prime, and n is even, q divides (n!)^2 + 1. - _Arkadiusz Wesolowski_, Sep 06 2012
%H T. D. Noe, <a href="/A104636/b104636.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[2, 300, 2], PrimeQ[2*# + 1] &]
%Y Cf. A005097, A104635.
%K easy,nonn
%O 1,1
%A _Zak Seidov_, Mar 18 2005
%E a(48)-a(57) from _Arkadiusz Wesolowski_, Sep 06 2012
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