OFFSET
1,6
COMMENTS
a(n) is the number of terms of A000051 that divide n.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
FORMULA
a(n) = Sum_{d|n} A209229(d-1).
Asymptotic mean: Limit_{m->oo} (1/m) * Sum_{k=1..m} a(k) = A323482 = 1.264499... . - Amiram Eldar, Dec 31 2023
MATHEMATICA
Table[DivisorSum[n, 1 &, IntegerQ@ Log2[# - 1] &], {n, 105}] (* Michael De Vlieger, Jun 11 2018 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 11 2018
STATUS
approved