OFFSET
1,2
COMMENTS
There are twelve of these divisors, which add up to 336. The harmonic mean of these divisors is 5, which is an integer, thus 140 is a harmonic divisor number (A001599). - Alonso del Arte, May 28 2017
MATHEMATICA
Divisors[140] (* Vladimir Joseph Stephan Orlovsky, Feb 18 2012 *)
PROG
(PARI) divisors(140) \\ Charles R Greathouse IV, Jun 22 2017
CROSSREFS
KEYWORD
nonn,fini,full,easy
AUTHOR
STATUS
approved