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A366771
Number of divisors of A001045(n) (Jacobsthal numbers).
3
1, 1, 2, 2, 2, 4, 2, 4, 6, 4, 2, 16, 2, 4, 8, 8, 2, 24, 2, 24, 8, 8, 2, 64, 8, 4, 16, 32, 4, 64, 2, 16, 16, 4, 16, 384, 4, 4, 8, 96, 4, 96, 2, 64, 48, 8, 4, 512, 4, 64, 32, 64, 4, 128, 24, 128, 16, 32, 8, 3072, 2, 4, 48, 64, 32, 256, 4, 64, 16, 256, 4, 6144, 4
OFFSET
1,3
LINKS
FORMULA
a(n) = sigma0(Jacobsthal(n)) = A000005(A001045(n)).
EXAMPLE
a(9) = 6 because Jacobsthal(9) = 171 has divisors {1, 3, 9, 19, 57, 171}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 21 2023
STATUS
approved