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 A288371 #9 Feb 26 2025 11:37:58
%S A288371 2,3,5,7,11,23,37,53,71,113,137,163,191,757,2161,2801,51521,1418561,
%T A288371 4093601,42456961,69509441,105616001,2420046721,9160905601,
%U A288371 1270453824641,2326680294401,190787784140801,509498986796801,2805949277824001,612940220628736001
%N A288371 Primes of the form k!9 + 1, where k!9 is the nonuple factorial number (A114806).
%H A288371 Robert Price, <a href="/A288371/b288371.txt">Table of n, a(n) for n = 1..55</a>
%H A288371 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>.
%F A288371 a(n) = 1 + A114806(A204660(n+1)). - _Elmo R. Oliveira_, Feb 26 2025
%t A288371 MultiFactorial[n_, k_] := If[n<1, 1, n*MultiFactorial[n-k, k]];
%t A288371 Select[Table[MultiFactorial[i, 9] + 1, {i, 0, 100}], PrimeQ[#]&]
%Y A288371 Cf. A114806, A204660.
%K A288371 nonn
%O A288371 1,1
%A A288371 _Robert Price_, Jun 08 2017