# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/ Search: id:a333986 Showing 1-1 of 1 %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, Table of n, a(n) for n = 1..1000 %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 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE