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 A262518 #7 Oct 03 2015 08:43:14 %S A262518 0,1,2,2,3,3,3,4,5,4,5,5,6,6,6,6,7,7,10,8,8,8,9,9,9,10,10,10,10,11,10, %T A262518 12,19,12,13,13,11,14,14,14,14,15,12,16,15,15,17,16,13,18,19,17,14,18, %U A262518 14,18,18,19,19,20,15,21,21,20,16,22,16,23,17,23,17,24,24,25,25,24,25,26,25,27,26,26,28,27,26,27,28,28,28,29,27,29,29 %N A262518 Even bisection of A155043. %C A262518 Number of steps needed to reach zero when starting from k = 2*n and repeatedly applying the map that replaces k by k - d(k), where d(k) is the number of divisors of k (A000005). %H A262518 Antti Karttunen, <a href="/A262518/b262518.txt">Table of n, a(n) for n = 0..10000</a> %F A262518 a(n) = A155043(2*n). %o A262518 (Scheme) (define (A262518 n) (A155043 (+ n n))) %Y A262518 Cf. A000005, A049820, A155043, A262519, A262520, A262682. %K A262518 nonn %O A262518 0,3 %A A262518 _Antti Karttunen_, Oct 02 2015