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A079872
signum(round(n^(1/Omega(n)))^Omega(n) - n), where Omega(n) is the total number of prime factors of n (A001222).
2
0, 0, 0, 0, 0, -1, 0, 0, 0, -1, 0, -1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, -1, 0, -1, 0, -1, 0, -1, 0, 0, 1, 1, 1, -1, 0, -1, -1, 1, 0, -1, 0, 1, 1, 1, 0, -1, 0, 1, -1, 1, 0, 1, -1, 1, 1, 1, 0, 1, 0, 1, 1, 0, -1, -1, 0, -1, -1, -1, 0, -1, 0, 1, -1, -1, 1, -1, 0, -1, 0, -1, 0, -1, -1, -1, -1, -1, 0, -1, 1, 1, 1, 1, 1, -1
OFFSET
1,1
COMMENTS
a(m) = 0 iff m is a prime power (A000961).
CROSSREFS
a(n)=A057427(A079869(n) - n).
Sequence in context: A323170 A215480 A143731 * A235046 A280046 A169672
KEYWORD
sign
AUTHOR
Reinhard Zumkeller, Jan 13 2003
STATUS
approved