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 A288879 #10 Apr 14 2025 05:34:28
%S A288879 29,31,37,107,307,907,12347,4188827,96342427,2324549427227,
%T A288879 17961239296027,52580450364682240027,262134882788466688027,
%U A288879 142299187144047333874073600027,1414585397090614713326770033423904956109645017737276725445918510284800000000027
%N A288879 Primes of the form k!3 + 3^3, where k!3 is the triple factorial number (A007661).
%H A288879 Robert Price, <a href="/A288879/b288879.txt">Table of n, a(n) for n = 1..19</a>
%H A288879 Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n3+3^3&action=Search">PRP Records.Search for n!3+3^3</a>.
%H A288879 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 A288879 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>.
%F A288879 a(n) = 27 + A007661(A247886(n)). - _Elmo R. Oliveira_, Apr 13 2025
%t A288879 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A288879 Select[Table[MultiFactorial[i, 3] + 3^3, {i, 0, 100}], PrimeQ[#]&]
%Y A288879 Cf. A007661, A247886.
%K A288879 nonn
%O A288879 1,1
%A A288879 _Robert Price_, Jun 18 2017