OFFSET
1,1
COMMENTS
In contrast to A100587, we take into account the empty set.
LINKS
Rémy Sigrist, Table of n, a(n) for n = 1..10000
EXAMPLE
For n = 6:
- 6 has 4 divisors,
- so a(n) = 2^4 = 16.
MATHEMATICA
Table[2^DivisorSigma[0, n], {n, 68}]
PROG
(PARI) a(n) = 2^numdiv(n)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Rémy Sigrist, Oct 31 2020
STATUS
approved