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 A062578 #17 Jul 04 2021 07:51:39 %S A062578 2,3,7,89,101,293,4463,70067 %N A062578 Numbers k such that 12^k - 11^k is prime. %C A062578 Terms greater than 1000 may correspond to unproven strong pseudoprimes. %o A062578 (PARI) is(n)=ispseudoprime(12^n-11^n) \\ _Charles R Greathouse IV_, May 22 2017 %Y A062578 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062578 nonn,hard %O A062578 1,1 %A A062578 _Mike Oakes_, May 18 2001, May 19 2001 %E A062578 New term 70067 (found in 2006) from _Jean-Louis Charton_, Sep 02 2009 %E A062578 Edited by _M. F. Hasler_, Sep 16 2013