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 A147683 #5 Oct 15 2013 03:39:51 %S A147683 1,3,7,10,12,15,17,22,28,29,49,64,113,117,124,127,129,138,140,143,152, %T A147683 182,183,194,197,199,203,229,238,248,260,264,285,302,308,322,329,355, %U A147683 379,385,390,402,444,455,465,493,495,502,507,523,537,542,568,575,582 %N A147683 Numbers n with property that 6n-1 is in A053182. %o A147683 (PARI) isok(n) = isprime(p=6*n-1) && isprime(p^2+p+1); \\ _Michel Marcus_, Oct 15 2013 %Y A147683 Cf. A053182. %K A147683 nonn %O A147683 1,2 %A A147683 _Zak Seidov_, Nov 10 2008