OFFSET
1,2
LINKS
Zak Seidov, Table of n, a(n) for n = 1..40
EXAMPLE
a(3) = 90 as 625=5^4=prime(3)^4, the third 4th power in the 4-almost primes, is the 90th 4-almost prime.
CROSSREFS
KEYWORD
nonn
AUTHOR
Rick L. Shepherd, Mar 05 2007
STATUS
approved