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 A062636 #20 Jul 04 2021 09:00:09 %S A062636 2,11,1301,78989,83117 %N A062636 Numbers k such that 70^k - 69^k is prime. %C A062636 Terms greater than 1000 are often only strong pseudoprimes. %C A062636 a(6) > 10^5. - _Robert Price_ Jan 15 2014 %o A062636 (PARI) is(n)=ispseudoprime(70^n-69^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A062636 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062636 nonn,hard,bref %O A062636 1,1 %A A062636 _Mike Oakes_, May 18 2001, May 19 2001 %E A062636 a(4)-a(5) from _Robert Price_, Jan 15 2014 (Computer run by Adam Marciniec)