login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A308593
a(n) = Sum_{d|n} d^(n^2/d).
2
1, 5, 28, 513, 3126, 840242, 823544, 8606711809, 7625984905477, 1221277338483250, 285311670612, 89215914432866222355906, 302875106592254, 316913110043605007120962336162, 608295209422788113565012727970423808, 680564733921105089459460296530789924865
OFFSET
1,2
LINKS
MATHEMATICA
Table[Sum[d^(n^2/d), {d, Divisors[n]}], {n, 1, 20}] (* Vaclav Kotesovec, Jun 09 2019 *)
PROG
(PARI) {a(n) = sumdiv(n, d, d^(n^2/d))}
CROSSREFS
Diagonal of A308509.
Sequence in context: A354897 A345632 A024068 * A249784 A359649 A346312
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Jun 09 2019
STATUS
approved