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 A193144 #18 Jan 06 2013 19:06:07
%S A193144 43,211,241,463,1123,1483,3307,3907,4831,6007,12433,14281,20023,20593,
%T A193144 24181,26083,37831,41413,42643,43891,46441,47743,77563,82657,95791,
%U A193144 98911,108571,145543,156421,158803,200257,205663,239611,284623,288907,304153,307471
%N A193144 Primes of the form n^2 + n + 1, where n is semiprime.
%C A193144 This is to semiprimes A001358 as A185632 is to nonprimes A018252.
%F A193144 {k: k is in A001358 and n^2 + n + 1 is in A000040}.
%e A193144 43 is in the sequence because it is prime, and 43 = 6^2 + 6 + 1 where 6 = 2*3 is semiprime.
%t A193144 Select[#^2+#+1&/@Select[Range[1000],PrimeOmega[#]==2&],PrimeQ] (* _Harvey P. Dale_, Jan 06 2013 *)
%Y A193144 Cf. A000040, A001358, A185632, A192321.
%K A193144 nonn,easy
%O A193144 1,1
%A A193144 _Jonathan Vos Post_, Dec 19 2012