OFFSET
2
LINKS
Antti Karttunen, Table of n, a(n) for n = 2..65537
EXAMPLE
For n=4, mu(n') = mu(4') = mu(4) = 0.
For n=7, mu(n') = mu(7') = mu(1) = 1.
PROG
(PARI) rd(n) = {local(fac); if(n<1, 0, fac=factor(n); sum(i=1, matsize(fac)[1], n*fac[i, 2]/fac[i, 1]; )); }
a(n) = moebius(rd(n)); \\ Michel Marcus, Sep 24 2013
CROSSREFS
KEYWORD
sign
AUTHOR
Luca Brigada Villa, Sep 24 2013
STATUS
approved