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 A225191 #21 Jul 29 2013 12:02:18 %S A225191 3,67,199,479,563,2243,2579,6599,7951,10099,10909,13759 %N A225191 Numbers n such that (15^n + 2^n)/17 is prime. %C A225191 All terms are odd primes. %C A225191 a(13) > 10^5. %t A225191 Select[Prime[Range[1, 100000]], PrimeQ[(15^# + 2^#)/17]&] %o A225191 (PARI) forprime(p=3,10^6, if(ispseudoprime((15^p + 2^p)/17), print1(p,", ") ) ); \\ _Joerg Arndt_, Jul 29 2013 %Y A225191 Cf. A057181, A125956, A125957, A222265. %K A225191 nonn,hard,more %O A225191 1,1 %A A225191 _Robert Price_, May 07 2013 %E A225191 Removed incorrect first term of "2".