OFFSET
1,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 1..10000
FORMULA
a(n) = A000203(n) -5*A000203(n/5) -A284150(n), where A000203(.) =0 for non-integer arguments. - R. J. Mathar, Mar 21 2017
EXAMPLE
Divisors of 12 are 1 2 3 4 6 12.
And 2 == 12 mod 5.
We get a(12) = 2 + 3 + 12 = 17.
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 21 2017
STATUS
approved