OFFSET
1,2
COMMENTS
Every nonnegative integer n appears A002865(n) times.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
Will Nicholes, List of prime signatures
EXAMPLE
72 (2^3*3^2, or 2*2*2*3*3) has a total of 5 prime factors when repetitions are counted. Since 72 = A181800(8), a(8) = 5.
CROSSREFS
KEYWORD
nonn
AUTHOR
Matthew Vandermast, Jun 09 2012
STATUS
approved