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A166569
Numbers n such that 12*n+7 is not prime.
1
4, 7, 9, 14, 15, 19, 20, 21, 24, 26, 28, 29, 32, 33, 34, 35, 37, 39, 42, 44, 46, 48, 49, 54, 55, 56, 58, 59, 63, 64, 66, 69, 70, 72, 74, 77, 78, 79, 81, 83, 84, 85, 89, 91, 92, 94, 95, 96, 98, 99, 100, 101, 103, 104, 105, 109, 111, 112, 113, 114, 115, 117, 119, 124, 125
OFFSET
1,1
LINKS
EXAMPLE
Distribution of the terms in the following triangular array:
*;
*,*;
*,*,*;
*,*,*,*;
*,4,*,*,*;
*,*,7,*,*,*;
*,*,*,*,*,*,*;
*,*,*,*,15,*,*,*;
*,*,*,*,*,20,*,*,*;
*,*,*,*,*,*,*,*,*,*;
*,9,*,*,*,*,*,32,*,*,*;
*,*,14,*,*,*,*,*,39,*,*,*; etc.
where * marks the non-integer values of (2*h*k + k + h - 3)/6 with h >= k >= 1. - Vincenzo Librandi, Jan 14 2013
MATHEMATICA
Select[Range[0, 200], !PrimeQ[12 # + 7] &] (* Vincenzo Librandi, Jan 14 2013 *)
PROG
(Magma) [n: n in [0..150] | not IsPrime(12*n+7)]; // Vincenzo Librandi, Jan 14 2013
CROSSREFS
Cf. A167056.
Sequence in context: A320691 A139444 A353020 * A024608 A287111 A187900
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Oct 29 2009
STATUS
approved