A366887 Sum of the odd squarefree divisors permuted by A163511.

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, 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, 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

Offset

0,4

Links

Antti Karttunen, Table of n, a(n) for n = 0..16384

Formula

a(n) = A206787(A163511(n)).

Prog

(PARI)
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));
A206787(n) = sumdiv(n, d, d*issquarefree(2*d));
A366887(n) = A206787(A163511(n));

Crossrefs

Cf. A163511, A206787, A366888 (rgs-transform).

Sequence in context: A196222 A035646 A144034 * A204714 A341100 A350639

Adjacent sequences: A366884 A366885 A366886 * A366888 A366889 A366890

Keyword

nonn

Author

Antti Karttunen, Nov 04 2023

Status

approved