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URL: https://oeis.org/A308814

⇱ A308814 - OEIS

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A308814
a(n) = Sum_{d|n} n^(d-1).
7
1, 3, 10, 69, 626, 7819, 117650, 2097673, 43046803, 1000010011, 25937424602, 743008621405, 23298085122482, 793714780783695, 29192926025441476, 1152921504875286545, 48661191875666868482, 2185911559749718382455, 104127350297911241532842, 5242880000000512000168021
OFFSET
1,2
LINKS
FORMULA
a(n) = A308813(n,n).
a(n) = A066108(n)/n.
a(n) ~ n^(n-1). - Vaclav Kotesovec, Jun 05 2021
MATHEMATICA
Table[Total[n^(Divisors[n]-1)], {n, 20}] (* Harvey P. Dale, Aug 08 2019 *)
PROG
(PARI) {a(n) = sumdiv(n, d, n^(d-1))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jun 26 2019
STATUS
approved