OFFSET
1,1
COMMENTS
Numbers such that the denominator of the fraction (sum of the divisors of n) divided by (the number of divisors of n) equals 3. - Harvey P. Dale, Jul 13 2012
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000
FORMULA
n such that A057021(n)=3.
MATHEMATICA
Select[Range[700], Denominator[DivisorSigma[1, #]/DivisorSigma[0, #]] == 3&] (* Harvey P. Dale, Jul 13 2012 *)
PROG
(Magma) [n:n in [1..700]|Denominator(SumOfDivisors(n)/#Divisors(n)) eq 3]; // Marius A. Burtea, Sep 08 2019
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 05 2002
STATUS
approved