OFFSET
1,6
COMMENTS
a(n) is the number of terms of A000225 less than n that divide n.
LINKS
Antti Karttunen, Table of n, a(n) for n = 1..65537
MATHEMATICA
Table[DivisorSum[n, 1 &, And[IntegerQ@ Log2[# + 1], # < n] &], {n, 105}] (* Michael De Vlieger, Jun 11 2018 *)
PROG
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 11 2018
STATUS
approved