Friendly number
id:
friendly-number-175-11833308
title:
Friendly number
text:
In number theory, friendly numbers are two or more natural numbers with a common abundancy index, the ratio between the sum of divisors of a number and the number itself. Two numbers with the same "abundancy" form a friendly pair; n numbers with the same abundancy form a friendly n-tuple. Being mutually friendly is an equivalence relation, and thus induces a partition of the positive naturals into clubs (equivalence classes) of mutually friendly numbers. A number that is not part of any friendly
brand slug:
wiki
category slug:
encyclopedia
description:
original url:
https://en.wikipedia.org/wiki/Friendly_number
date created:
2006-01-23T20:03:26Z
date modified:
2024-09-03T06:33:35Z
main entity:
{"identifier":"Q1707307","url":"https://www.wikidata.org/entity/Q1707307"}
image:
fields total:
13
integrity:
14