A366770 Number of prime factors of A001045(n) (Jacobsthal numbers) (counted with multiplicity).
0, 0, 1, 1, 1, 2, 1, 2, 3, 2, 1, 4, 1, 2, 3, 3, 1, 5, 1, 5, 3, 3, 1, 6, 3, 2, 5, 5, 2, 6, 1, 4, 4, 2, 4, 9, 2, 2, 3, 7, 2, 7, 1, 6, 6, 3, 2, 9, 2, 6, 5, 6, 2, 8, 5, 7, 4, 5, 3, 12, 1, 2, 6, 6, 5, 8, 2, 6, 4, 8, 2, 13, 2, 4, 6, 6, 5, 7, 1, 9, 9, 4, 5, 13, 3, 4
Offset: 1
Keywords
Examples
a(9) = 3 because Jacobsthal(9) = 171 = 3^2 * 19.
Links
- Amiram Eldar, Table of n, a(n) for n = 1..1122