A153236 Numbers n such that 8*n + 3 is not prime.

3, 4, 6, 9, 11, 12, 14, 15, 18, 19, 21, 23, 24, 25, 27, 29, 30, 32, 33, 34, 36, 37, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 53, 54, 56, 57, 59, 60, 63, 64, 66, 67, 69, 72, 74, 75, 76, 78, 79, 81, 83, 84, 87, 88, 89, 90, 91, 93, 94, 95, 96, 97

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:
*;
*,*;
*,4,*;
3,*,*,*;
*,*,*,12,*;
*,*,11,*,*,*;
*,9,*,*,*,24,*;
6,*,*,*,23,*,*,*;
*,*,*,21,*,*,*,40,*;
*,*,18,*,*,*,39,*,*,*;
*,14,*,*,*,37,*,*,*,60,*;
9,*,*,*,34,*,*,*,59,*,*,*; etc.
where * marks the non-integer values of (2*h*k + k + h - 1)/4 with h >= k >= 1. - Vincenzo Librandi, Jan 15 2013

Mathematica

Select[Range[0, 200], !PrimeQ[8 # + 3] &] (* Vincenzo Librandi, Jan 12 2013 *)

Prog

(Magma) [n: n in [0..110] | not IsPrime(8*n+3)]; // Vincenzo Librandi, Jan 12 2013

Crossrefs

Cf. A007520, A005124, A139487.

Sequence in context: A342577 A037969 A329862 * A158705 A047415 A087805

Adjacent sequences: A153233 A153234 A153235 * A153237 A153238 A153239

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 21 2008

Status

approved