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 A086939 #6 May 28 2015 18:44:57 %S A086939 2,6,9,12,10,24,14,32,36,30,22,60,26,42,45,80,34,72,38,100,63,66,46, %T A086939 120,50,78,108,84,58,150,62,160,99,102,70,180,74,114,117,240,82,168, %U A086939 86,132,225,138,94,288,98,300,153,156,106,216,110,224,171,174,118 %N A086939 Greatest m with A086571(m) = n. %C A086939 A086938(n) < a(n); A086571(a(n)) = A086571(A086938(n)) = n; %C A086939 n and A086571 are divisors of a(n); %C A086939 a(n) = A086572(A086938(n)), A086938(n) = A086572(a(n)). %H A086939 Ivan Neretin, <a href="/A086939/b086939.txt">Table of n, a(n) for n = 1..10000</a> %K A086939 nonn %O A086939 1,1 %A A086939 _Reinhard Zumkeller_, Jul 24 2003