A240531 Numbers n such that 24*n + 19 is not prime.

3, 4, 7, 9, 10, 14, 16, 17, 18, 19, 24, 27, 29, 31, 34, 38, 39, 40, 41, 42, 44, 45, 47, 49, 50, 51, 52, 54, 55, 56, 57, 58, 59, 62, 64, 66, 68, 69, 73, 74, 75, 76, 78, 79, 80, 81, 84, 85, 87, 89, 92, 94, 95, 96, 99, 100, 101, 103, 104, 106, 107, 108, 109

Offset: 1

Author

Vincenzo Librandi, Apr 13 2014

Keywords

• nonn
• easy

Comments

Integer values of (2*h*k + k + h - 9)/12, with h >= k >= 1.

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..8000

Crossrefs

Cf. A139532.

Programs

Magma

[n: n in [1..220]| not IsPrime(24*n+19)];

Mathematica

Select[Range[110], !PrimeQ[24 # + 19] &]