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 A247465 #12 Feb 16 2025 08:33:23
%S A247465 10,19,28,50,67,77,89,112,139,146,184,194,233,310,311,388,886,1139,
%T A247465 1648,1694,2405,2554,3709,4015,5410,5908,6407,8065,9061,9875,11722,
%U A247465 13471,26026,26656,29441,32741
%N A247465 Numbers n such that n!3 - 3^5 is prime.
%C A247465 Large terms correspond to probable primes.
%C A247465 a(37) > 50000.
%H A247465 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n!3-243&action=Search">PRP Records. Search for n!3-243</a>
%H A247465 Joe McLean, <a href="http://web.archive.org/web/20091027034731/http://uk.geocities.com/nassarawa%40btinternet.com/probprim2.htm">Interesting Sources of Probable Primes</a>
%H A247465 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%H A247465 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Multifactorial.html">Multifactorial</a>
%e A247465 10!3-243 = 10*7*4*1-243 = 37 is prime, so 10 is in the sequence.
%t A247465 MultiFactorial[n_, k_] := If[n < 1, 1, If[n < k + 1, n, n*MultiFactorial[n - k, k]]];
%t A247465 lst={};Do[If[PrimeQ[MultiFactorial[n, 3] - 243], AppendTo[lst, n]], {n, 100}];lst
%Y A247465 Cf. A007661, A037082, A084438, A243078.
%K A247465 nonn,more
%O A247465 1,1
%A A247465 _Robert Price_, Sep 17 2014