OFFSET
1,2
COMMENTS
LINKS
Jaroslav Krizek, Table of n, a(n) for n = 1..1000
FORMULA
a(n) = 1 for numbers in A020491.
EXAMPLE
For n = 6: phi(6)/tau(6) = 2/4 = 1/2; a(6) = 2.
MATHEMATICA
Table[Denominator[EulerPhi[n]/DivisorSigma[0, n]], {n, 120}] (* Michael De Vlieger, Dec 10 2016 *)
PROG
(Magma) [Denominator(EulerPhi(n)/NumberOfDivisors(n)): n in[1..1000]]
(PARI) a(n) = denominator(eulerphi(n)/numdiv(n)) \\ Felix Fröhlich, Dec 09 2016
CROSSREFS
KEYWORD
nonn,frac
AUTHOR
Jaroslav Krizek, Dec 09 2016
STATUS
approved