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 A188901 #13 Sep 12 2021 14:27:29 %S A188901 0,1,2,1,3,2,4,3,2,5,4,3,1,6,5,4,2,7,3,6,5,3,8,4,2,7,6,4,9,5,3,8,4,7, %T A188901 5,1,10,6,4,9,5,3,8,6,2,11,7,5,10,6,4,2,9,7,3,5,12,8,6,2,11,7,5,3,10, %U A188901 8,4,6,4,13,9,7,3,12,8,6,4,11 %N A188901 Integers in the sequences (arithmetic derivative of k) divided by k. %C A188901 Integers in the sequence (k'/k) = A003415(k)/k. See A072873 for the values of k where k'/k is an integer. %H A188901 Alois P. Heinz, <a href="/A188901/b188901.txt">Table of n, a(n) for n = 1..10000</a> (first 2500 terms from Nathaniel Johnston) %e A188901 1' = 0, 0/1 = 0 -> a(1) = 0; %e A188901 4' = 4 ,4/4 = 1 -> a(2) = 1; %e A188901 16' = 32, 32/16 = 2 -> a(3) = 2. %Y A188901 Cf. A003415, A068311, A072873, A083346, A083346, A085731, A086130, A189100, A189102. %K A188901 nonn %O A188901 1,3 %A A188901 _Giorgio Balzarotti_, Apr 16 2011