OFFSET
1,3
COMMENTS
k is the number of divisors of arithmetic numbers A003601.
EXAMPLE
a(12) = 5 because 1 + 2 + 4 + 6 + 12 = 25 = 5*5 for m = 5.
CROSSREFS
KEYWORD
nonn
AUTHOR
Ilya Lopatin and Juri-Stepan Gerasimov, May 10 2014
STATUS
approved