

A174189


Numbers k such that A000040(k) +/ A163300(k) are both prime.


0



1, 7, 9, 12, 24, 30, 36, 63, 90, 102, 117, 126, 135, 150, 156, 165, 171, 180, 183, 225, 234, 270, 285, 369, 390, 399, 402, 447, 456, 501, 507, 537, 570, 582, 624, 627, 642, 651, 654, 660, 720, 735, 762, 777, 855, 864, 870, 885, 930, 936, 945
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OFFSET

1,2


LINKS



FORMULA



EXAMPLE

a(1) = 1 because 20 = 2 is prime, and 2+0 = 2 is prime.
a(2) = 7 because 1714 = 3 is prime, and 17+14 = 31 is prime.
a(3) = 9 because 2318 = 5 is prime, and 23+18 = 41 is prime.


CROSSREFS



KEYWORD

nonn


AUTHOR



EXTENSIONS

Corrected (11 replaced by 12, 128 replaced by 126) and extended by R. J. Mathar, Apr 16 2010


STATUS

approved



