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 A086287 #15 Feb 21 2020 05:23:50
%S A086287 1,2,3,2,5,3,7,2,3,5,3,7,5,2,3,5,7,3,5,3,7,5,2,7,3,5,7,5,3,7,5,3,7,5,
%T A086287 7,2,7,3,5,5,3,7,5,3,7,5,7,3,7,5,5,7,2,5,7,3,7,5,5,3,7,7,5,7,3,7,5,7,
%U A086287 3,7,5,5,3,7,5,7,2,5,7,3,7,5,7,5,3,7,7,7,5,5,7,3,7,5,5,7,3,7,7,5
%N A086287 Greatest prime factor of 7-smooth numbers.
%H A086287 Amiram Eldar, <a href="/A086287/b086287.txt">Table of n, a(n) for n = 1..10000</a>
%F A086287 a(n) = A006530(A002473(n)).
%F A086287 A086286(n) <= a(n) <= 7.
%t A086287 Reap[Do[p = FactorInteger[n][[-1, 1]]; If[p < 11, Sow[p]], {n, 1, 500}] ][[2, 1]] (* _Jean-François Alcover_, Dec 17 2017 *)
%Y A086287 Cf. A002473, A006530, A086286.
%K A086287 nonn
%O A086287 1,2
%A A086287 _Reinhard Zumkeller_, Jul 15 2003