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 A288881 #11 Apr 14 2025 07:39:20
%S A288881 271,523,1123,24344563,96342643,608608243,5577337931669504243,
%T A288881 52580450364682240243,262134882788466688243,13106744139423334400243,
%U A288881 694657439389436723200243,7368624314106569113600243,12931890526958090978845347074978621685760000243
%N A288881 Primes of the form k!3 + 3^5, where k!3 is the triple factorial number (A007661).
%H A288881 Robert Price, <a href="/A288881/b288881.txt">Table of n, a(n) for n = 1..15</a>
%H A288881 Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=n3+3^5&action=Search">PRP Records.Search for n!3+3^5</a>.
%H A288881 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 A288881 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>.
%F A288881 a(n) = 243 + A007661(A247868(n)). - _Elmo R. Oliveira_, Apr 14 2025
%t A288881 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A288881 Select[Table[MultiFactorial[i, 3] + 3^5, {i, 0, 100}], PrimeQ[#]&]
%Y A288881 Cf. A007661, A247868.
%K A288881 nonn
%O A288881 1,1
%A A288881 _Robert Price_, Jun 18 2017