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 A139091 #9 Feb 13 2020 11:55:02
%S A139091 17,827,22319071,1718296754087,35662591735219,477262171871,
%T A139091 1609727002420791262479701,146215297537890243023,
%U A139091 2020914387433686758547638152441,1073774770807266077323
%N A139091 a(n) = largest prime divisor of the number prime(n)!/9 + 1.
%H A139091 Amiram Eldar, <a href="/A139091/b139091.txt">Table of n, a(n) for n = 4..26</a>
%t A139091 a = {}; Do[w = FactorInteger[(Prime[n]! + 9)/9]; AppendTo[a, Last[w][[1]]], {n, 4, 16}]; a
%Y A139091 Cf. A082672, A089085, A089130, A117141, A007749, A139056-A139066, A020458, A139068, A137390, A139070-A139075, A136019, A136020, A136026, A136027, A139089-A139092.
%K A139091 nonn
%O A139091 4,1
%A A139091 _Artur Jasinski_, Apr 08 2008