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 A062633 #18 Jul 04 2021 09:00:17 %S A062633 3,5,43,2399,88037 %N A062633 Numbers k such that 67^k - 66^k is prime. %C A062633 Terms greater than 1000 are often only strong pseudoprimes. %C A062633 a(6) > 10^5. - _Robert Price_, Oct 03 2013 %o A062633 (PARI) is(n)=ispseudoprime(67^n-66^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062633 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062633 nonn,hard %O A062633 1,1 %A A062633 _Mike Oakes_, May 18 2001, May 19 2001 %E A062633 a(5) from _Robert Price_, Oct 03 2013 (Computer run by Adam Marciniec)