A366772 Sum of the divisors of A001045(n) (Jacobsthal numbers).

1, 1, 4, 6, 12, 32, 44, 108, 260, 384, 684, 2688, 2732, 5632, 15936, 27864, 43692, 153920, 174764, 499968, 953920, 1477440, 2796204, 11708928, 12253248, 22380544, 69769600, 115568640, 181990200, 620101632, 715827884, 1826150832, 3880589184, 5726797824

Offset

1,3

Links

Amiram Eldar, Table of n, a(n) for n = 1..1122

Formula

a(n) = sigma(Jacobsthal(n)) = A000203(A001045(n)).

Example

a(9) = 260 because Jacobsthal(9) = 171 has divisors {1, 3, 9, 19, 57, 171}.

Crossrefs

Cf. A000203, A001045, A366769, A366770, A366771, A063477.

Sequence in context: A133427 A027070 A087785 * A081198 A275978 A242211

Adjacent sequences: A366769 A366770 A366771 * A366773 A366774 A366775

Keyword

nonn

Author

Sean A. Irvine, Oct 21 2023

Status

approved