OFFSET
1,1
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..208
FORMULA
a(n) = Min_{x : d(x) = A000005(x) = p(n)^2} = 6^(p(n)-1) because x = 2^(pp-1) > 2^(p-1)3^(p-1) holds if p > 1.
EXAMPLE
1296 = 2*2*2*2*3*3*3*3 is the smallest number with 25 divisors.
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Jun 01 2001
STATUS
approved