A153129 Numbers n such that 8*n + 5 is not prime.

2, 5, 8, 9, 10, 11, 14, 15, 16, 17, 20, 23, 25, 26, 27, 29, 30, 31, 32, 35, 37, 38, 40, 41, 42, 44, 45, 47, 50, 51, 53, 54, 55, 56, 58, 59, 60, 61, 62, 64, 65, 66, 68, 70, 71, 72, 73, 74, 75, 77, 78, 79, 80, 83, 85, 86, 89, 90, 92, 93, 95, 97, 98, 100

Offset: 1

Author

Vincenzo Librandi, Dec 19 2008

Keywords

• nonn
• easy

Examples

			*;
*, *;
2, *, *;
*, 5, *, *;
*, *, 9, *, *;
*, *, *, 14, *, *;
5, *, *, *, 20, *, *;
*, 10, *, *, *, 27, *, *;
*, *, 16, *, *, *, 35, *, *;
where * marks the non-integer values of (2*n*k + k + n - 2)/4 with n >= k >= 1. - _Vincenzo Librandi_, Nov 30 2012
		

Links

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

Crossrefs

Cf. A105133.

Programs

Magma

[n: n in [1..120] | not IsPrime(8*n + 5)]; // Vincenzo Librandi, Nov 30 2012

Mathematica

Select[Range[200], !PrimeQ[8# + 5] &] (* Vincenzo Librandi, Nov 30 2012 *)