A018270 Divisors of 70.

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

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

Links

Table of n, a(n) for n=1..8.

Index entries for sequences related to divisors of numbers

Mathematica

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

Prog

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

Crossrefs

Sequence in context: A276465 A018406 A018483 * A080180 A159942 A102339

Adjacent sequences: A018267 A018268 A018269 * A018271 A018272 A018273

Keyword

nonn,fini,full,easy

Author

N. J. A. Sloane.

Status

approved