OFFSET
1,2
LINKS
David A. Corneth, Table of n, a(n) for n = 1..20000
Eric Weisstein's World of Mathematics, Prime Signature
FORMULA
If p is prime, a(p) = prime(p). a(p^k) = prime(p^k)^k. More generally, if n = m^k, a(n) = [n-th number whose prime signature is the same as m]^k.
CROSSREFS
KEYWORD
nonn
AUTHOR
Franklin T. Adams-Watters, Jul 12 2006
STATUS
approved