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 A366887 #6 Nov 04 2023 14:00:41 %S A366887 1,1,1,4,1,4,4,6,1,4,4,6,4,24,6,8,1,4,4,6,4,24,6,8,4,24,24,48,6,32,8, %T A366887 12,1,4,4,6,4,24,6,8,4,24,24,48,6,32,8,12,4,24,24,48,24,192,48,96,6, %U A366887 32,32,72,8,48,12,14,1,4,4,6,4,24,6,8,4,24,24,48,6,32,8,12,4,24,24,48,24,192,48,96,6,32,32,72,8 %N A366887 Sum of the odd squarefree divisors permuted by A163511. %H A366887 Antti Karttunen, <a href="/A366887/b366887.txt">Table of n, a(n) for n = 0..16384</a> %F A366887 a(n) = A206787(A163511(n)). %o A366887 (PARI) %o A366887 A163511(n) = if(!n, 1, my(p=2, t=1); while(n>1, if(!(n%2), (t*=p), p=nextprime(1+p)); n >>= 1); (t*p)); %o A366887 A206787(n) = sumdiv(n, d, d*issquarefree(2*d)); %o A366887 A366887(n) = A206787(A163511(n)); %Y A366887 Cf. A163511, A206787, A366888 (rgs-transform). %K A366887 nonn %O A366887 0,4 %A A366887 _Antti Karttunen_, Nov 04 2023