OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[2, 150], !PrimeQ[4 # - 5]&] (* Vincenzo Librandi, Apr 06 2013 *)
PROG
(Magma) [n: n in [2..150] | not IsPrime(4*n-5)]; // Vincenzo Librandi, Apr 06 2013
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 07 2009
STATUS
approved