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A153236
Numbers n such that 8*n + 3 is not prime.
1
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
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
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 21 2008
STATUS
approved