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 A238202 #8 Feb 22 2014 21:13:40 %S A238202 43,503,631,827,971,1063,1153,1283,1373,1429,1433,1493,1523,1553,1619, %T A238202 1693,1877,2113,2239,2243,2297,2423,2477,2531,2609,2683,2851,2927, %U A238202 2999,3203,3221,3319,3463,3533,3557,3571,3583,3701 %N A238202 Primes p such that b = 2*p + 1 is semiprime and c = 2*b + 1 is 3-almost prime. %C A238202 Subsequence of A234095 and A000040, e.g., a(1) = 43 = A234095(4) = A000040(14). %e A238202 2*43 + 1 = 87 = 2*29 = A001358(30), 2*87 + 1 = 175 = 5*5*7 = A014612(43). %o A238202 (PARI) forprime(p=2,4000,if(bigomega(a=2*p+1)==2&&bigomega(b=2*a+1)==3,print(p","))) %Y A238202 Cf. A000040, A001358, A014612, A234095. %K A238202 nonn %O A238202 1,1 %A A238202 _Zak Seidov_, Feb 20 2014