This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A153261 #6 May 01 2013 21:10:56
%S A153261 2,17,19,29,31,41,59,73,79,83,89,97,101,107,109,131,139,149,151,157,
%T A153261 173,179,197,199,223,227,229,233,239,241,269,281,283,311,317,349,353,
%U A153261 359,367,379,383,389,397,409,419,421,439,449,457,463,479,499,503,509,521
%N A153261 Primes p such that 3*p-2 is not prime.
%C A153261 3*2-2=4 not prime, 17*3-2=49 not prime,... 3*3-2=7 is prime and not in this sequence.
%t A153261 lst={};Do[p=Prime[n];If[ !PrimeQ[3*p-2],AppendTo[lst,p]],{n,6!}];lst
%Y A153261 Cf. A153184, A088878
%Y A153261 Cf. A153238 [From _Vincenzo Librandi_, Jan 01 2009]
%K A153261 nonn
%O A153261 1,1
%A A153261 _Vladimir Joseph Stephan Orlovsky_, Dec 22 2008
%E A153261 Minor edits by _N. J. A. Sloane_, Jul 08 2010