A241571 - OEIS

%I #11 Sep 08 2022 08:46:07

%S 0,3,5,6,9,10,12,15,17,18,20,21,24,25,27,30,31,33,35,36,38,39,40,42,

%T 45,48,50,51,52,53,54,55,57,59,60,63,64,65,66,69,70,72,73,75,77,78,80,

%U 81,84,85,86,87,90,93,94,95,96,97,99,100,101,102,103,105,108

%N Numbers n such that 2*n+15 is not a prime.

%H Vincenzo Librandi, <a href="/A241571/b241571.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[0, 200], !PrimeQ[2 # + 15] &]

%o (Magma) [n: n in [0..200] | not IsPrime(2*n+15)];

%Y Complement of A089559.

%Y Cf. similar sequence listed in A153144.

%K nonn,easy

%O 1,2

%A _Vincenzo Librandi_, Apr 27 2014