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 A051592 #24 May 31 2024 20:43:36 %S A051592 3,4,6,12,14,54,74,102,114,302,318,366,614,1178,1188,3110,7284,21432, %T A051592 21906,25848,29882,38618,41990,84510,86022 %N A051592 Numbers k such that k!!!!!! - 1 is prime. %C A051592 k!!!!!! = k*(k-6)*(k-12)*(k-18)*... %C A051592 The search for multifactorial primes started by Ray Ballinger is now continued by a team of volunteers on the website of Ken Davis (see link). %H A051592 Ray Ballinger, <a href="http://web.archive.org/web/20160604135248/http://www.prothsearch.net/multifac.html">Status of Search for Multifactorial Primes</a>. %H A051592 Ken Davis, <a href="http://mfprimes.free-dc.org">Status of Search for Multifactorial Primes</a>. %H A051592 Ken Davis, <a href="http://mfprimes.free-dc.org/mfdata/f06m.html">Results for n!6-1.</a>. %t A051592 MultiFactorial[n_, k_] := If[n < 1, 1, n*MultiFactorial[n - k, k]]; %t A051592 Select[Range[0, 1000], PrimeQ[MultiFactorial[#, 6] - 1] & ] (* _Robert Price_, Apr 19 2019 *) %Y A051592 Cf. A085158 (sextuple factorials), A085150. %K A051592 hard,nonn %O A051592 1,1 %A A051592 _N. J. A. Sloane_ %E A051592 Edited and extended by _Hugo Pfoertner_, Jun 23 2003 %E A051592 Corrected and extended by Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 03 2008