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 A062650 #20 Jul 04 2021 09:02:28 %S A062650 2,41,67,7699,12409 %N A062650 Numbers k such that 84^k - 83^k is prime. %C A062650 Terms greater than 1000 are often only strong pseudoprimes. %C A062650 a(6) > 20000. - _Derek Orr_, Sep 22 2014 %C A062650 a(6) > 10^5. - _Robert Price_, Mar 05 2015 %o A062650 (PARI) is(n)=ispseudoprime(84^n-83^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062650 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062650 nonn,hard,more %O A062650 1,1 %A A062650 _Mike Oakes_, May 18 2001, May 19 2001 %E A062650 a(5) from _Derek Orr_, Sep 22 2014