A166563 Numbers n such that 12*n+5 is not prime.

5, 6, 10, 13, 15, 17, 18, 20, 25, 27, 28, 30, 31, 34, 35, 36, 39, 40, 41, 44, 45, 48, 50, 52, 55, 57, 59, 60, 61, 62, 65, 69, 70, 72, 74, 75, 76, 80, 82, 83, 85, 86, 89, 90, 93, 94, 95, 96, 97, 100, 103, 104, 105, 109, 110, 111, 112, 115, 116, 118, 120, 121, 122, 125, 126

Offset

1,1

Links

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

Example

Distribution of the terms in the following triangular array:
*;
*,*;
*,*,*;
*,*,*,*;
*,*,6,*,*;
*,5,*,*,*,*;
*,*,*,*,*,*,*;
*,*,*,*,*,18,*,*;
*,*,*,*,17,*,*,*,*;
*,*,*,*,*,*,*,*,*,*;
*,*,13,*,*,*,*,*,36,*,*;
*,10,*,*,*,*,*,35,*,*,*,*; etc.
where * marks the non-integer values of (2*h*k + k + h - 2)/6 with h >= k >= 1. - Vincenzo Librandi, Jan 14 2013

Mathematica

Select[Range[0, 200], !PrimeQ[12 # + 5] &] (* Vincenzo Librandi, Jan 14 2013 *)

Prog

(Magma) [n: n in [0..150] | not IsPrime(12*n+5)]; // Vincenzo Librandi, Jan 14 2013

Crossrefs

Cf. A167055.

Sequence in context: A102506 A062845 A236307 * A005847 A109758 A287665

Adjacent sequences: A166560 A166561 A166562 * A166564 A166565 A166566

Keyword

nonn,easy

Author

Vincenzo Librandi, Oct 29 2009

Status

approved