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 A204231 #10 Oct 30 2018 10:31:02 %S A204231 1,2,3,4,7,10,12,13,14,19,23,27,33,37,41,42,44,49,59,61,69,72,76,83, %T A204231 88,89,111,121,126,127,134,137,143,144,146,149,159,163,170,177,178, %U A204231 186,189,195,197,198,204,208,214,217,220,224,228,233,234,236,243,247,248,249,276,278,288,294,295,335,338,353,354,380,382,384,395,401,402,408,411,427 %N A204231 Position of primes in A127345. %H A204231 Zak Seidov, <a href="/A204231/b204231.txt">Table of n, a(n) for n = 1..1000</a> %F A204231 A127346(n) = A127345(a(n)). %o A204231 (PARI) p=2; q=3; n=0; forprime(r=5, 1e3, n++; if(isprime(p*q+p*r+q*r), print1(n", ")); p=q; q=r) \\ _Charles R Greathouse IV_, Jan 13 2012 %Y A204231 Cf. A127345, A127346. %K A204231 nonn %O A204231 1,2 %A A204231 _Zak Seidov_, Jan 13 2012