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A366782 Number of divisors of A000073(n) (tribonacci numbers). 4
1, 1, 2, 3, 2, 2, 8, 6, 5, 2, 4, 24, 6, 8, 21, 16, 3, 8, 16, 12, 8, 12, 8, 6, 12, 12, 8, 80, 12, 24, 168, 20, 16, 12, 144, 24, 32, 16, 128, 12, 4, 16, 4, 32, 32, 16, 96, 320, 4, 48, 72, 216, 8, 32, 256, 48, 4, 8, 32, 48, 384, 32, 96, 576, 12, 4, 16, 36, 8, 8 (list; graph; refs; listen; history; text; internal format)
OFFSET
2,3
LINKS
FORMULA
a(n) = A000005(A000073(n)).
EXAMPLE
a(8)=8 because the 8th tribonacci number 24 has divisors {1, 2, 3, 4, 6, 8, 12, 24}.
MATHEMATICA
DivisorSigma[0, LinearRecurrence[{1, 1, 1}, {1, 1, 2}, 70]] (* Amiram Eldar, Oct 23 2023 *)
CROSSREFS
Sequence in context: A300862 A151863 A365407 * A134142 A353390 A298310
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 22 2023
STATUS
approved

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Last modified February 22 09:32 EST 2024. Contains 370250 sequences. (Running on oeis4.)