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A228358 Numbers n such that 3*n - 4 is not prime. 2

%I

%S 1,4,6,8,10,12,13,14,16,18,20,22,23,24,26,27,28,30,32,33,34,36,38,40,

%T 41,42,43,44,46,48,49,50,52,53,54,55,56,58,60,62,63,64,66,68,69,70,71,

%U 72,73,74,75,76,78,80,82,83,84,86,88,90,92,93,94,96,97,98,100,101

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

%C After 1, all terms are given by A153170 +2. [_Bruno Berselli_, Aug 21 2013]

%H Vincenzo Librandi, <a href="/A228358/b228358.txt">Table of n, a(n) for n = 1..1000</a>

%e 8 is in the sequence since 3*8 - 4 = 20 is not prime.

%t Select[Range[230], ! PrimeQ[3 # - 4]&]

%o (MAGMA) [n: n in [1..120] | not IsPrime(3*n -4)];

%Y Cf. A153170, A228121.

%K nonn,easy

%O 1,2

%A _Vincenzo Librandi_, Aug 21 2013

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Last modified April 20 03:36 EDT 2019. Contains 322294 sequences. (Running on oeis4.)