A157255 a(n) = sigma_(n^n)(n).

1, 17, 7625597484988

Offset

1,2

Links

Amiram Eldar, Table of n, a(n) for n = 1..4

Mathematica

Table[DivisorSigma[n^n, n], {n, 1, 5}]

Prog

(PARI) a(n) = sigma(n, n^n); \\ Amiram Eldar, Mar 01 2024

Crossrefs

Cf. A000312, A023887.

Sequence in context: A346997 A343778 A271562 * A114432 A134686 A257305

Adjacent sequences: A157252 A157253 A157254 * A157256 A157257 A157258

Keyword

bref,nonn

Author

Vladimir Joseph Stephan Orlovsky, Feb 26 2009

Status

approved