A174189 Numbers k such that A000040(k) +/- A163300(k) are both prime.

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

Offset

1,2

Links

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

Formula

a(n) = A112529(n-1) for n >= 2. - Georg Fischer, Oct 24 2018

Example

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

Crossrefs

Cf. A000040, A112529, A163300.

Sequence in context: A020720 A048589 A121056 * A112529 A352876 A161892

Adjacent sequences: A174186 A174187 A174188 * A174190 A174191 A174192

Keyword

nonn

Author

Juri-Stepan 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