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%I #10 Jul 16 2013 03:05:24
%S 9,21,37,45,49,57,69,97,117,121,129,141,157,169,177,201,205,217,225,
%T 229,261,285,289,297,301,309,321,337,381,385,405,429,441,465,469,477,
%U 489,505,517,525,549,565,577,597,601,609,625,645,649,661,681
%N (A007519(n)+1)/2.
%o (PARI) isok(n) = (n % 4 == 1) && isprime(2*n-1) \\ _Michel Marcus_, Jul 16 2013
%K nonn
%O 1,1
%A _Marco Matosic_, Feb 17 2011
%E More terms from _Michel Marcus_, Jul 16 2013
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