A336698 a(n) = A000265(1+A000265(sigma(n))), where A000265(k) gives the odd part of k.

1, 1, 1, 1, 1, 1, 1, 1, 7, 5, 1, 1, 1, 1, 1, 1, 5, 5, 3, 11, 1, 5, 1, 1, 1, 11, 3, 1, 1, 5, 1, 1, 1, 7, 1, 23, 5, 1, 1, 23, 11, 1, 3, 11, 5, 5, 1, 1, 29, 47, 5, 25, 7, 1, 5, 1, 3, 23, 1, 11, 1, 1, 7, 1, 11, 5, 9, 1, 1, 5, 5, 49, 19, 29, 1, 9, 1, 11, 3, 47, 61, 1, 11, 1, 7, 17, 1, 23, 23, 59, 1, 11, 1, 5, 1, 1, 25

Offset: 1

Author

Antti Karttunen, Aug 02 2020

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..16384
• Antti Karttunen, Data supplement: n, a(n) computed for n = 1..65537
• Index entries for sequences related to sigma(n)

Crossrefs

Cf. A000203, A000265, A161942, A336699, A336701.

Programs

PARI

A000265(n) = (n>>valuation(n,2));
A336698(n) = A000265(1+A000265(sigma(n)));

Formula

a(n) = A000265(1+A000265(A000203(n))) = A000265(1+A161942(n)).

a(A000265(n)) = A336699(n).