A153282 Numbers k such that 3*k + 4 is not prime.

0, 2, 4, 6, 7, 8, 10, 12, 14, 15, 16, 17, 18, 20, 22, 24, 26, 27, 28, 29, 30, 32, 34, 36, 37, 38, 39, 40, 42, 43, 44, 46, 47, 48, 50, 52, 54, 55, 56, 57, 58, 60, 61, 62, 64, 66, 67, 68, 70, 71, 72, 74, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 92, 94, 95, 96, 97, 98, 99, 100

Offset: 1

Author

Vincenzo Librandi, Dec 23 2008

Keywords

• nonn
• easy

Comments

Complement of A034936. - Omar E. Pol, Jan 18 2009

Examples

			Distribution of the odd terms in the following triangular array:
*;
*,7;
*,*,15;
*,*,*,*;
*,17.*,*,39;
*,*,29,*,*,55;
*,*, *,*,*,*, *;
*,27,*,*,61,*,*,95;
*,*,43,*,*,81,*,*,119;
*,*, *,*,*,*, *,*, *, *;
*,37,*,*,83,*,*,129,*,*,175;
*,*,57,*,*,107,*,*,157,*,*,207; etc.
where * marks the non-integer values of (4*h*k + 2*k + 2*h - 3)/3 with h >= k >= 1. - _Vincenzo Librandi_, Jan 17 2013
		

Links

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

Crossrefs

Cf. A034936.

Programs

Magma

[n: n in [0..150] | not IsPrime(3*n + 4)]; // Vincenzo Librandi, Jan 12 2013

Mathematica

Select[Range[0, 200], !PrimeQ[3*# + 4]&] (* Vincenzo Librandi, Jan 12 2013 *)

Extensions

Edited (and terms confirmed) by N. J. A. Sloane, Jan 18 2009