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

1,1

Links

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

Example

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.

Mathematica

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

Prog

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

Crossrefs

Cf. A092022.

Sequence in context: A061951 A346301 A341257 * A246647 A177729 A049993

Adjacent sequences: A153345 A153346 A153347 * A153349 A153350 A153351

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 24 2008

Status

approved