A153348 Numbers n such that 16*n+3 is not prime.

2, 3, 6, 7, 9, 12, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 27, 28, 30, 32, 33, 36, 37, 38, 39, 42, 44, 45, 47, 48, 50, 51, 52, 53, 54, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 67, 69, 71, 72, 75, 76, 77, 78, 79, 81, 82, 83, 84, 85, 86, 87, 88, 90, 92, 93, 94

Offset: 1

Author

Vincenzo Librandi, Dec 24 2008

Keywords

• nonn
• easy

Examples

			Triangle begins:
*;
*,*;
*,2,*;
*,*,*,*;
*,*,*,6,*;
*,*.*,*,*,*;
*,*,*,*,*,12,*;
3,*,*,*,*,*,*,*;
*,*,*,*,*,*,*,20,*;
*,*,9,*,*,*,*,*,*,*;
*,7,*,*,*,*,*,*,*,30,*;
*,*,*,*,17,*,*,*,*,*,*,*;
where * marks the non-integer values of (2*h*k + k + h - 1)/8 with h >= k >= 1.
		

Links

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

Crossrefs

Cf. A092022.

Programs

Magma

[n: n in [0..150] | not IsPrime(16*n + 3)]; // Vincenzo Librandi, Jan 13 2013

Mathematica

Select[Range[200], !PrimeQ[16*# + 3]&] (* Vincenzo Librandi, Jan 13 2013 *)