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 A062579 #20 Jul 04 2021 07:51:22 %S A062579 17,31,41,47,109,163,643,2459,9743,30271,87557 %N A062579 Numbers k such that 13^k - 12^k is prime. %C A062579 Terms greater than 1000 may correspond to (unproven) strong pseudoprimes. [Clarified by _M. F. Hasler_, Sep 16 2013] %o A062579 (PARI) is(n)=ispseudoprime(13^n-12^n) \\ _Charles R Greathouse IV_, Jun 12 2017 %Y A062579 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062579 nonn,hard %O A062579 1,1 %A A062579 _Mike Oakes_, May 18 2001, May 19 2001 %E A062579 Two more terms 30271 and 87557 (found in 2007 and 2008) from _Jean-Louis Charton_, Sep 02 2009