%I
%S 2,17,19,29,31,41,59,73,79,83,89,97,101,107,109,131,139,149,151,157,
%T 173,179,197,199,223,227,229,233,239,241,269,281,283,311,317,349,353,
%U 359,367,379,383,389,397,409,419,421,439,449,457,463,479,499,503,509,521
%N Primes p such that 3*p2 is not prime.
%C 3*22=4 not prime, 17*32=49 not prime,... 3*32=7 is prime and not in this sequence.
%t lst={};Do[p=Prime[n];If[ !PrimeQ[3*p2],AppendTo[lst,p]],{n,6!}];lst
%Y Cf. A153184, A088878
%Y Cf. A153238 [From _Vincenzo Librandi_, Jan 01 2009]
%K nonn
%O 1,1
%A _Vladimir Joseph Stephan Orlovsky_, Dec 22 2008
%E Minor edits by _N. J. A. Sloane_, Jul 08 2010
