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A366783
Sum of the divisors of A000073(n) (tribonacci numbers).
2
1, 1, 3, 7, 8, 14, 60, 84, 121, 150, 414, 1560, 1352, 2304, 7239, 12480, 10713, 22400, 67032, 154056, 166560, 334880, 770160, 1322090, 2020564, 3712800, 8461404, 21427200, 17008752, 37733696, 154277568, 219104032, 249664896, 341958960, 1575703584, 1997069256
OFFSET
2,3
LINKS
FORMULA
a(n) = A000203(A000073(n)).
EXAMPLE
a(8)=60 because the 8th tribonacci number 24 has divisors {1, 2, 3, 4, 6, 8, 12, 24}.
MATHEMATICA
DivisorSigma[1, LinearRecurrence[{1, 1, 1}, {1, 1, 2}, 36]] (* Amiram Eldar, Oct 23 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 22 2023
STATUS
approved