login
A153264
Numbers n such that 16*n+15 is not prime.
1
0, 3, 5, 6, 8, 9, 10, 12, 15, 17, 18, 19, 20, 21, 24, 25, 27, 30, 31, 32, 33, 34, 35, 36, 38, 39, 40, 41, 42, 43, 45, 47, 48, 49, 50, 51, 52, 54, 55, 57, 58, 59, 60, 62, 63, 65, 66, 69, 70, 72, 73, 74, 75, 77, 78, 80, 81, 83, 84, 85, 86, 87, 90, 93, 94, 95, 96, 99
OFFSET
1,2
LINKS
EXAMPLE
Distribution of the terms in the following triangular array:
*;
0,*;
*,*,*;
*,*,3,*;
*,*,*,*,*;
*,*,*,*,8,*;
*,*,*,*,*,*,*;
*,*,*,*,*,*,15,*;
*,5,*,*,*,*,*,*,*;
3,*,*,*,*,*,*,*,24,*;
*,*,*,12,*,*,*,*,*,*,*;
*,*,10,*,*,*,*,*,*,*,35,*; etc.
where * marks the non-integer values of (2*h*k + k + h - 7)/8 with h >= k >= 1. - Vincenzo Librandi, Jan 15 2013
MATHEMATICA
Select[Range[0, 200], !PrimeQ[16 # + 15] &] (* Vincenzo Librandi, Jan 12 2013 *)
PROG
(Magma) [n: n in [0..150] | not IsPrime(16*n+15)]; // Vincenzo Librandi, Jan 12 2013
CROSSREFS
Cf. A127575.
Sequence in context: A307206 A026430 A002150 * A249595 A133561 A095117
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Dec 22 2008
EXTENSIONS
0 added by Arkadiusz Wesolowski, Aug 03 2011
STATUS
approved