OFFSET
1,2
COMMENTS
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
Distribution of the even terms in the following triangular array:
*;
*, 6;
*, *,14;
*, *,*,*;
*,16,*,*,38;
*,*,28,*,*,54;
*,*, *,*,*, *,*;
*,26,*,*,60,*,*,94;
*,*,42,*,*,80,*,*,118;
*,*,*, *,*,*, *,*, *, *;
*,36,*,*,82,*,*,128,*,*,174;
*,*,56,*,*,106,*,*,156,*,*,206; etc.
where * marks the non-integer values of (4*h*k + 2*k + 2*h - 6)/3 with h >= k >= 1. - Vincenzo Librandi, Jan 15 2013
MATHEMATICA
Select[Range[0, 100], !PrimeQ[3 # + 7] &] (* Vincenzo Librandi, Oct 15 2012 *)
PROG
(Magma) [n: n in [0..100] | not IsPrime(3*n + 7)]; // Vincenzo Librandi, Oct 15 2012
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved