A241571 Numbers n such that 2*n+15 is not a prime.

0, 3, 5, 6, 9, 10, 12, 15, 17, 18, 20, 21, 24, 25, 27, 30, 31, 33, 35, 36, 38, 39, 40, 42, 45, 48, 50, 51, 52, 53, 54, 55, 57, 59, 60, 63, 64, 65, 66, 69, 70, 72, 73, 75, 77, 78, 80, 81, 84, 85, 86, 87, 90, 93, 94, 95, 96, 97, 99, 100, 101, 102, 103, 105, 108

Offset: 1

Author

Vincenzo Librandi, Apr 27 2014

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Crossrefs

Complement of A089559.

Cf. similar sequence listed in A153144.

Programs

Magma

[n: n in [0..200] | not IsPrime(2*n+15)];

Mathematica

Select[Range[0, 200], !PrimeQ[2 # + 15] &]