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 A332448 #6 Feb 14 2020 18:55:38 %S A332448 0,1,2,0,2,3,3,2,0,1,3,2,1,4,4,0,1,0,2,1,5,2,4,4,0,1,3,3,3,3,5,1,5,2, %T A332448 5,1,2,4,3,1,1,6,4,2,1,3,5,2,0,0,3,1,2,5,3,5,4,1,4,3,1,6,3,0,2,4,2,2, %U A332448 6,4,3,1,1,1,2,3,6,3,4,1,0,2,2,5,3,2,5,2,1,1,4,3,7,4,5,3,1,4,2,0,2,4,3,1,7 %N A332448 a(n) = A007814(A087808(sigma(n))). %H A332448 Antti Karttunen, <a href="/A332448/b332448.txt">Table of n, a(n) for n = 1..65537</a> %H A332448 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a> %H A332448 <a href="/index/Si#SIGMAN">Index entries for sequences related to sigma(n)</a> %F A332448 a(n) = A007814(A332224(n)) = A332447(A000203(n)) = A007814(A087808(A000203(n))). %o A332448 (PARI) %o A332448 A087808(n) = if(n<1, 0, if(n%2==0, 2*A087808(n/2), A087808((n-1)/2)+1)); %o A332448 A332448(n) = valuation(A087808(sigma(n)),2); %Y A332448 Cf. A000203, A007814, A087808, A332224, A332447. %Y A332448 Cf. A332443 (positions of zeros). %K A332448 nonn %O A332448 1,3 %A A332448 _Antti Karttunen_, Feb 14 2020