A018270 Divisors of 70.

1, 2, 5, 7, 10, 14, 35, 70

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• fini
• full
• easy

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

Links

• Index entries for sequences related to divisors of numbers

Programs

Mathematica

Divisors[70] (* Alonso del Arte, Oct 07 2017 *)

PARI

divisors(70) \\ Charles R Greathouse IV, Jun 21 2017