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 A062598 #20 Jul 04 2021 07:53:50 %S A062598 5,1427,2357,24499 %N A062598 Numbers k such that 32^k - 31^k is prime. %C A062598 Terms > 1000 often correspond only to strong pseudoprimes. %C A062598 a(5) > 10^5. - _Robert Price_, Oct 03 2012 %o A062598 (PARI) is(n)=ispseudoprime(32^n-31^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062598 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062598 nonn,hard %O A062598 1,1 %A A062598 _Mike Oakes_, May 18 2001, May 19 2001 %E A062598 a(4) from _Robert Price_, Oct 03 2012