OFFSET
0,3
COMMENTS
a(n) has the same prime signature as n: the permutation maps primes to primes, squares to squares, cubes to cubes, and so on.
LINKS
FORMULA
EXAMPLE
Example of multiplicativity: a(7)=11, a(23)=37, a(7*23) = a(161) = a(7)*a(23) = 11*37 = 407.
CROSSREFS
KEYWORD
AUTHOR
Antti Karttunen, Dec 31 2013
STATUS
approved