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 A062621 #22 Jul 04 2021 08:44:31 %S A062621 2,5,7,701 %N A062621 Numbers k such that 55^k - 54^k is prime. %C A062621 a(5) > 10^5. - _Robert Price_, Nov 05 2012 %o A062621 (PARI) is(n)=ispseudoprime(55^n-54^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062621 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062621 nonn,hard %O A062621 1,1 %A A062621 _Mike Oakes_, May 18 2001, May 19 2001