OFFSET
1,1
LINKS
Daniel Forgues, Table of n, a(n) for n=1..10000
FORMULA
a(n) = {k}_n * (-1)^(Pi(m) - Pi(m-1)) where {k}_n is the exponent of {m^k}_n (the n-th perfect power with positive integer base m corresponding to largest integer exponent k) and Pi(m) is the prime counting function evaluated at m.
CROSSREFS
KEYWORD
sign
AUTHOR
Daniel Forgues, Mar 10 2009
STATUS
approved