%I
%S 1,2,4,7,8,9,10,11,13,15,17,18,22,25,27,28,30,33,34,38,39,41,43,46,49,
%T 50,52,56,59,62,63,64,66,69,72,73,75,76,80,81,85,91,92,93,95,96,98,99,
%U 105,108,109,112,113,115,118,123,125,126,127,134,135,137,140,141,143
%N Exactly one of 2n^21 and 2n^2+1 is prime.
%C Numbers in A089001 or in A066049 but not in both. [From _R. J. Mathar_, Mar 09 2010]
%e a(1)=1 because 2*1^21=1 is nonprime and 2*1^2+1=3 is prime.
%K nonn
%O 1,2
%A _JuriStepan Gerasimov_, Mar 01 2010
%E 37 removed by _R. J. Mathar_, Mar 09 2010
