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 A236371 #6 Jan 25 2014 12:15:07 %S A236371 2,3,4,12,27,28,34,36,147,179,242,276,278,466,735,2371,4548,5606, %T A236371 10324,82899 %N A236371 Numbers n such that 7^n - 12 is prime. %C A236371 a(21) > 10^5. %t A236371 Select[Range[1, 100000], PrimeQ[7^# - 12] &] %o A236371 (PARI) for(n=1, 5*10^5, if(isprime(7^n-12), print1(n, ", "))) %Y A236371 Cf. A236371, A217131, A191469, A090669, A096305, A217130, A217132, A152213. %K A236371 nonn %O A236371 1,1 %A A236371 _Robert Price_, Jan 23 2014