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Proper in math means not equal to self, and 17 is prime, so there is only one: 1. Prime numbers don't have proper factors.

The factors of 17 are itself and one because 17 is a prime number.

www.reference.com/math/factors-17-71ea65374b73a202

What Are the Factors of 17? The two factors of 17 are 1 and 17. Because 17 only has one set of factors, or factor pair, it is a prime number. This means it can only be divided by 1 and itself. A factor is a number that can be multiplied to produce another number. In this example, 17 is a prime number because it can only be divided evenly, or ...

www.mathsisfun.com/definitions/proper-factor.html

Illustrated definition of Proper Factor: Any of the factors of a number, except 1 or the number itself. All positive factors of 12: 1,2,3,4,6,12 Proper...

www.calculatorsoup.com/calculators/math/factors.php

The Factoring Calculator finds the factors and factor pairs of a positive or negative number. Enter an integer number to find its factors. For positive integers the calculator will only present the positive factors because that is the normally accepted answer. For example, you get 2 and 3 as a factor pair of 6.

www.reference.com/math/proper-factors-2d428687f2f00ba9

In general, a factor of N is a whole number, or integer, that divides N without a remainder. For example, the factors of 20 are 1, 2, 4, 5, 10 and 20. The proper factors of 20 are 2, 4, 5 and 10. Usually, when factoring a number, it is desirable to report only the prime factors, or factors that are also prime numbers.

www.superteacherworksheets.com/factors/proper-factors.pdf?...

c. List all of the proper factors of 17. _____ d. List all of the proper ... Therefore, a prime number only has one proper factor: 1. The only proper factor of 7 is 1. a. List all of the factors for the number 9. 1, 3, 9 List all of the proper factors of 9. 1 and 3 b.

en.wikipedia.org/wiki/Perfect_number

In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum).Equivalently, a perfect number is a number that is half the sum of all of its positive divisors (including itself) i.e. σ 1 (n) = 2n. ...

85.what-are-the-factors.com

What Are the Factors of 85? The factors of 85 are 1, 5, 17, 85. Calcating the factors of 85 is straightforward. The first two factors - and sometimes the only two - are the number itself, and 1. Try 1. 1 x 85 = 85, so put these into our factor list.

findthefactors.com/tag/48

Here is a four piece puzzle arranged two different ways. There are 24 blue squares and 24 yellow squares. 24 + 24 = 48. Read on to see why the factors of 48 are significant to this puzzle.

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