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 A062631 #25 Jul 04 2021 09:00:25 %S A062631 5,31,9013,29077,35543,56809,60167 %N A062631 Numbers k such that 65^k - 64^k is prime. %C A062631 Terms greater than 1000 are often only strong pseudoprimes. %C A062631 All terms are prime. - _Robert Price_, Aug 09 2013 %C A062631 a(8) > 10^5. - _Robert Price_, Aug 09 2013 %o A062631 (PARI) is(n)=ispseudoprime(65^n-64^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062631 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062631 nonn,hard,more %O A062631 1,1 %A A062631 _Mike Oakes_, May 18 2001, May 19 2001 %E A062631 a(4)-a(7) (calculations by Adam Marciniec) - _Robert Price_, Aug 09 2013