

A018270


Divisors of 70.


1




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



