login
A228358
Numbers n such that 3*n - 4 is not prime.
2
1, 4, 6, 8, 10, 12, 13, 14, 16, 18, 20, 22, 23, 24, 26, 27, 28, 30, 32, 33, 34, 36, 38, 40, 41, 42, 43, 44, 46, 48, 49, 50, 52, 53, 54, 55, 56, 58, 60, 62, 63, 64, 66, 68, 69, 70, 71, 72, 73, 74, 75, 76, 78, 80, 82, 83, 84, 86, 88, 90, 92, 93, 94, 96, 97, 98, 100, 101
OFFSET
1,2
COMMENTS
After 1, all terms are given by A153170 +2. [Bruno Berselli, Aug 21 2013]
LINKS
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
Sequence in context: A227405 A061408 A063287 * A134331 A276040 A360694
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Aug 21 2013
STATUS
approved