OFFSET
1,2
COMMENTS
This number has eight divisors which add up 144. Since that's more than twice 70, the number is abundant. However, 4 is not a divisor, nor can 4 be obtained from the smaller divisors (1 and 2), so there is only one way, the trivial way, to express 70 as a sum of distinct divisors. This is a sharp contrast to most abundant numbers. Hence 70 is a weird number (A006037). - Alonso del Arte, Oct 07 2017
MATHEMATICA
Divisors[70] (* Alonso del Arte, Oct 07 2017 *)
PROG
(PARI) divisors(70) \\ Charles R Greathouse IV, Jun 21 2017
CROSSREFS
KEYWORD
nonn,fini,full,easy
AUTHOR
STATUS
approved