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 A225807 #9 Jun 06 2017 14:35:02 %S A225807 2,83,1907,2591,16223,17183 %N A225807 Numbers n such that (17^n - 2^n)/15 is prime. %C A225807 All terms are primes. %C A225807 a(7) > 10^5. %t A225807 Select[ Prime[ Range[1, 100000] ], PrimeQ[ (17^# - 2^#)/15 ]& ] %o A225807 (PARI) is(n)=ispseudoprime((17^n-2^n)/15) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A225807 Cf. A128031, A225955, A217320, A006034. %K A225807 more,nonn %O A225807 1,1 %A A225807 _Robert Price_, Jul 29 2013