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 A062640 #20 Jul 04 2021 09:02:04 %S A062640 23,193,811 %N A062640 Numbers k such that 74^k - 73^k is prime. %C A062640 a(4) > 10^5. - _Robert Price_, May 23 2014 %o A062640 (PARI) is(n)=ispseudoprime(74^n-73^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062640 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062640 nonn,hard,bref %O A062640 1,1 %A A062640 _Mike Oakes_, May 18 2001, May 19 2001