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A258647
Seventh arithmetic derivative of n.
3
0, 0, 0, 0, 4, 0, 0, 0, 752, 0, 0, 0, 1520, 0, 0, 368, 3424, 0, 0, 0, 1552, 0, 0, 0, 3120, 0, 176, 27, 3424, 0, 0, 0, 8592, 0, 0, 752, 3312, 0, 0, 1520, 912, 0, 0, 0, 8144, 752, 0, 0, 16304, 0, 368, 608, 3312, 0, 5076, 1520, 8976, 0, 0, 0, 8976, 0, 0, 240
OFFSET
0,5
LINKS
FORMULA
a(n) = A003415^7(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, 7):
seq(a(n), n=0..70);
CROSSREFS
Column k=7 of A258651.
Cf. A003415.
Sequence in context: A222953 A101193 A258646 * A013334 A258648 A185232
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jun 06 2015
STATUS
approved