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 A062609 #17 Jul 04 2021 08:43:19 %S A062609 3,13,43,211 %N A062609 Numbers k such that 43^k - 42^k is prime or a strong pseudoprime. %C A062609 a(5) > 10^5 - _Robert Price_, Dec 24 2012 %o A062609 (PARI) forprime(n=1, 9999, ispseudoprime(43^n-42^n) && print1(n", ")) \\ - M. F. Hasler, Sep 21 2013 %Y A062609 Cf. A000043, A057468, A059801-A059803, A062572-A062608, A215632, A062611-A062666. %K A062609 nonn,hard %O A062609 1,1 %A A062609 _Mike Oakes_, May 18 2001, May 19 2001 %E A062609 Edited by _M. F. Hasler_, Sep 21 2013