OFFSET
1,2
COMMENTS
After 1, all terms are given by A153170 +2. [Bruno Berselli, Aug 21 2013]
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
8 is in the sequence since 3*8 - 4 = 20 is not prime.
MATHEMATICA
Select[Range[230], ! PrimeQ[3 # - 4]&]
PROG
(Magma) [n: n in [1..120] | not IsPrime(3*n -4)];
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 21 2013
STATUS
approved