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

1,1

Links

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

Example

*;
*, *;
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

Mathematica

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

Prog

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

Crossrefs

Cf. A105133.

Sequence in context: A072955 A288730 A276784 * A076871 A070049 A085254

Adjacent sequences: A153126 A153127 A153128 * A153130 A153131 A153132

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 19 2008

Status

approved