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Values of n such that exactly one of 5n+1 and 5n^2+5n+1 is prime.
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%I #3 Mar 30 2012 18:52:39

%S 1,3,4,5,7,8,11,12,13,15,16,17,19,20,21,22,24,25,32,35,42,43,44,48,49,

%T 50,52,55,56,60,61,63,69,70,71,73,74,79,81,82,84,85,86,87,88,92,93,94,

%U 98,101,106,107,108,109,110,112,115,117,120,123,126,127,131,132,135,137

%N Values of n such that exactly one of 5n+1 and 5n^2+5n+1 is prime.

%Y Cf. A090563.

%K nonn

%O 1,2

%A _Juri-Stepan Gerasimov_, Feb 07 2010

%E 56 inserted by _R. J. Mathar_, Mar 09 2010