

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

Table of n, a(n) for n=1..51.


FORMULA

a(n) = A112529(n1) for n >= 2.  Georg Fischer, Oct 24 2018


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

Cf. A000040, A112529, A163300.
Sequence in context: A020720 A048589 A121056 * A112529 A161892 A056528
Adjacent sequences: A174186 A174187 A174188 * A174190 A174191 A174192


KEYWORD

nonn


AUTHOR

JuriStepan Gerasimov, Mar 11 2010


EXTENSIONS

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


STATUS

approved



