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(Created page with "The factors of 21 are usually 1, 3, 7, and 21, but sometimes factors is used to describe the number 1, 3, 7 (excluding the number itself. The proper factors of 21 might be 1,...") |
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The factors of 21 are usually 1, 3, 7, and 21, but sometimes factors is used to describe the number 1, 3, 7 (excluding the number itself. | The factors of 21 are usually 1, 3, 7, and 21, but sometimes factors is used to describe the number 1, 3, 7 (excluding the number itself). | ||
The proper factors of 21 might be 1, 3, and 7<ref>[https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100349667 Oxford reference: proper factors]</ref>; or 3 and 7<ref>[https://mathworld.wolfram.com/ProperFactor.html Wolfram MathWorld]</ref>. | The proper factors of 21 might be 1, 3, and 7<ref>[https://www.oxfordreference.com/view/10.1093/oi/authority.20110803100349667 Oxford reference: proper factors]</ref>; or 3 and 7<ref>[https://mathworld.wolfram.com/ProperFactor.html Wolfram MathWorld]</ref>. | ||
Latest revision as of 15:41, 2 July 2021
The factors of 21 are usually 1, 3, 7, and 21, but sometimes factors is used to describe the number 1, 3, 7 (excluding the number itself).
The proper factors of 21 might be 1, 3, and 7[1]; or 3 and 7[2].
"Factor" and "divisor" are often used interchangably, but are given distinct meanings by others: Wolfram MathWorld states that proper factors exclude 1 and the number itself, while proper divisors include 1 and exclude the number itself.
There is also inconsistency over whether to include negative numbers as factors or divisors.