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 A187205 #13 Jul 13 2013 12:03:48 %S A187205 10,40,50,56,104,130,136,160,170,171,224,230,232,250,290,310,312,370, %T A187205 392,410,430,459,470,520,530,560,590,610,624,640,648,670,710,730,790, %U A187205 830,890,896,970,1000,1010,1030,1070,1088,1090,1130,1160,1216,1218,1221 %N A187205 Numbers such that the last of the absolute differences of divisors is 0. %C A187205 Numbers n such that A187203(n) = 0. %H A187205 Reinhard Zumkeller, <a href="/A187205/b187205.txt">Table of n, a(n) for n = 1..1000</a> %o A187205 (Haskell) %o A187205 import Data.List (elemIndices) %o A187205 a187205 n = a187205_list !! (n-1) %o A187205 a187205_list = map (+ 1) $ elemIndices 0 $ map a187203 [1..] %Y A187205 Cf. A027750, A187202, A187203, A187204. %K A187205 nonn %O A187205 1,1 %A A187205 _Omar E. Pol_, Aug 01 2011