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 A288884 #9 Apr 14 2025 07:39:07
%S A288884 6563,6571,6841,2504908961,17961239302561,81359229958561,
%T A288884 664565853958561,2295148179742698933452806561,
%U A288884 628962407176689215723405312006561,43414370923880963682387072385024006561,116346745870073113470947277571643877742200278220800006561
%N A288884 Primes of the form k!3 + 3^8, where k!3 is the triple factorial number (A007661).
%H A288884 Robert Price, <a href="/A288884/b288884.txt">Table of n, a(n) for n = 1..18</a>
%H A288884 Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n3+3^8&action=Search">PRP Records.Search for n!3+3^8</a>.
%H A288884 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 A288884 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>.
%F A288884 a(n) = 6561 + A007661(A264867(n)). - _Elmo R. Oliveira_, Apr 14 2025
%t A288884 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A288884 Select[Table[MultiFactorial[i, 3] + 3^8, {i, 0, 100}], PrimeQ[#]&]
%Y A288884 Cf. A007661, A264867.
%K A288884 nonn
%O A288884 1,1
%A A288884 _Robert Price_, Jun 18 2017