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 A116896 #13 Nov 15 2024 14:49:25 %S A116896 0,1,2,6,42,604,1976,5126,14124 %N A116896 Numbers k such that k! + k!! + 1 is prime, where k!! denotes double factorial (A006882). %C A116896 1976! + 1976!! + 1 is a 5657-digit prime. Next term is greater than 4000. %H A116896 Joe McLean, <a href="http://web.archive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim.htm">Interesting Sources of Probable Primes</a> %e A116896 6! + 6!! + 1 = 769, which is prime. %Y A116896 Cf. A000142, A006882, A116897. %K A116896 hard,more,nonn %O A116896 1,3 %A A116896 _Giovanni Resta_, Mar 04 2006 %E A116896 a(8) from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008 %E A116896 a(9) from _Michael S. Branicky_, Nov 15 2024