A228358 Numbers n such that 3*n - 4 is not prime.

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

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

Cf. A153170, A228121.

Sequence in context: A227405 A061408 A063287 * A134331 A276040 A360694

Adjacent sequences: A228355 A228356 A228357 * A228359 A228360 A228361

Keyword

nonn,easy

Author

Vincenzo Librandi, Aug 21 2013

Status

approved