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 A062645 #14 Jul 04 2021 09:01:39 %S A062645 2,5,7,41,79,2957,9949 %N A062645 Numbers k such that 79^k - 78^k is prime. %C A062645 Terms > 1000 are often only strong pseudoprimes. %C A062645 a(8) > 10^5. - _Robert Price_, Nov 10 2014 %o A062645 (PARI) is(n)=ispseudoprime(79^n-78^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062645 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062645 nonn,hard %O A062645 1,1 %A A062645 _Mike Oakes_, May 18 2001, May 19 2001