OFFSET
1,1
COMMENTS
Euler phi value divided by Chowla function gives integer.
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..10000
EXAMPLE
In A062972, n=15: q = 8/8 = 1; n=101: q = 100/1 = 100. While integer quotient chowla(n)/phi(n) gives only 5 nonprime solutions below 20000000 (see A070037), here, the integer reciprocals, q = phi(n)/chowla(n) obtained with squared primes and with other composites. If n=p^2, q = p(p-1)/p = p-1. So for squared primes, the quotients give A006093.
MATHEMATICA
Do[s=EulerPhi[n]/(DivisorSigma[1, n]-n-1); If[IntegerQ[s], Print[n]], {n, 2, 100000}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Labos Elemer, Apr 26 2002
STATUS
approved