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 A062641 #16 Jul 04 2021 09:02:01 %S A062641 2,3,53,101,223,1699 %N A062641 Numbers k such that 75^k - 74^k is prime. %C A062641 Terms greater than 1000 are often only strong pseudoprimes. %C A062641 a(7) > 10^5. - _Robert Price_, Jun 29 2014 %o A062641 (PARI) is(n)=ispseudoprime(75^n-74^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062641 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062641 nonn,hard %O A062641 1,1 %A A062641 _Mike Oakes_, May 18 2001, May 19 2001