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A258644 Fourth arithmetic derivative of n. 3
0, 0, 0, 0, 4, 0, 0, 0, 80, 0, 0, 0, 176, 0, 1, 32, 368, 0, 1, 0, 112, 0, 0, 0, 240, 0, 16, 27, 368, 0, 0, 0, 752, 5, 0, 80, 272, 0, 1, 176, 220, 0, 0, 0, 608, 80, 1, 0, 1552, 5, 32, 48, 272, 0, 540, 176, 560, 0, 0, 0, 560, 0, 6, 44, 7168, 7, 0, 0, 284, 12, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = A003415^4(n).

MAPLE

d:= n-> n*add(i[2]/i[1], i=ifactors(n)[2]):

A:= proc(n, k) option remember; `if`(k=0, n, d(A(n, k-1))) end:

a:= n-> A(n, 4):

seq(a(n), n=0..70);

CROSSREFS

Column k=4 of A258651.

Cf. A003415.

Sequence in context: A099306 A228630 A174647 * A169770 A287633 A222931

Adjacent sequences:  A258641 A258642 A258643 * A258645 A258646 A258647

KEYWORD

nonn,look

AUTHOR

Alois P. Heinz, Jun 06 2015

STATUS

approved

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Last modified November 13 10:29 EST 2019. Contains 329093 sequences. (Running on oeis4.)