A186295 A007519(n)-2.

15, 39, 71, 87, 95, 111, 135, 191, 231, 239, 255, 279, 311, 335, 351, 399, 407, 431, 447, 455, 519, 567, 575, 591, 599, 615, 639, 671, 759, 767, 807, 855, 879, 927, 935, 951, 975, 1007, 1031, 1047, 1095, 1127, 1151, 1191, 1199, 1215

Offset: 1

Author

Marco Matosic, Feb 17 2011

Keywords

• nonn

Programs

PARI

isok(n) = isprime(p=n+2) && (p % 8 == 1) \\ Michel Marcus, Jul 16 2013

Formula

a(n) = 2*A186294(n) - 3. - Michel Marcus, Jul 16 2013