OFFSET
1,2
COMMENTS
It can be shown that phi(n)*tau(n) >= n, which means that quotient = n/tau(n) <= phi(n); note: a(n)+5 is positive.
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..2000
FORMULA
a(n) = A062355(n) - 2*n. - Amiram Eldar, Jul 10 2024
MATHEMATICA
Table[EulerPhi[n]DivisorSigma[0, n]-2n, {n, 90}] (* Harvey P. Dale, Feb 03 2021 *)
PROG
(PARI) a(n)={eulerphi(n)*numdiv(n) - 2*n} \\ Harry J. Smith, Aug 11 2009
CROSSREFS
KEYWORD
sign
AUTHOR
Labos Elemer, Jul 20 2001
EXTENSIONS
Offset changed from 0 to 1 by Harry J. Smith, Aug 11 2009
STATUS
approved