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A153763
Numbers k >= 0 such that 8*k+9 is not prime.
1
0, 2, 3, 5, 6, 7, 9, 12, 14, 15, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 30, 32, 33, 35, 36, 37, 39, 40, 42, 44, 45, 46, 47, 48, 51, 52, 54, 57, 58, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 72, 75, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93
OFFSET
1,2
LINKS
EXAMPLE
Distribution of the terms in the following triangular array:
0;
*,2;
*,*,5;
*,*,*,9;
3,*,*,*,14;
*,7,*,*,*,20;
*,*,12,*,*,*,27;
*,*,*,18,*,*,*,35;
6,*,*,*,25,*,*,*,44;
*,12,*,*,*,33,*,*,*,54;
*,*,19,*,*,*,42,*,*,*,65; etc.
where * marks the non-integer values of (2*h*k + k + h - 4)/4 with h >= k >= 1. - Vincenzo Librandi, Jan 14 2013
MATHEMATICA
Select[Range[0, 200], !PrimeQ[8 # + 9] &] (* Vincenzo Librandi, Jan 14 2013 *)
PROG
(Magma) [n: n in [0..150] | not IsPrime(8*n+9)]; // Vincenzo Librandi, Jan 14 2013
CROSSREFS
Sequence in context: A253083 A108130 A195060 * A345982 A050747 A261514
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 01 2009
STATUS
approved