A186294 - OEIS

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A186294

(A007519(n)+1)/2.

%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