OFFSET
1,3
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..1122
EXAMPLE
a(9) = 6 because Jacobsthal(9) = 171 has divisors {1, 3, 9, 19, 57, 171}.
CROSSREFS
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Oct 21 2023
STATUS
approved