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 A333986 #30 Mar 13 2023 02:54:56
%S A333986 2,3,2,7,2,5,3,5,7,5,7,5,127,7,8191,5,127,13,31,127,127,89,31,17,127,
%T A333986 31,3221,179,151,127,8191,13,262657,11939,199,257,127,127,337,257,
%U A333986 524287,73,1093,547,137,241,1093,547,331,131071,1093,599479,8191,137,127,8191
%N A333986 Greatest prime factor of A007497(n).
%H A333986 Amiram Eldar, <a href="/A333986/b333986.txt">Table of n, a(n) for n = 1..1000</a>
%F A333986 a(n) = A006530(A007497(n)). - _Michel Marcus_, Sep 09 2020
%t A333986 f[1] = 2; f[n_] := f[n] = DivisorSigma[1, f[n - 1]]; Table[FactorInteger[f[n]][[-1, 1]], {n, 50}] (* _Amiram Eldar_, Sep 23 2020 *)
%Y A333986 Cf. A006530, A007497.
%K A333986 nonn
%O A333986 1,1
%A A333986 _Richard Peterson_, Sep 04 2020
%E A333986 More terms from _Michel Marcus_, Sep 16 2020