how to find the perfect of a number ?

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https://www.cuemath.com/numbers/perfect-numbers

https://www.cuemath.com/numbers/perfect-numbers
What are Perfect Numbers? Definition, Examples, and Facts – Cuemath
In order to find a perfect number, we can use the technique told by Euclid. According to Euclid, there is an expression that can be a perfect number subject to a specific condition. According to his proposition, if 2 n -1 is a prime number, then 2 n-1 (2 n -1) is a perfect number. This condition can be understood using the following table.

https://byjus.com/maths/perfect-numbers

https://byjus.com/maths/perfect-numbers
Perfect Numbers – BYJU’S
Solution: We know that every perfect number can be expressed as 2p – 1(2p – 1) where p is a prime number. Using the above formula let us find the perfect numbers from 1 to 500. For n = 2, 22 – 1(22 – 1) = 2 (4 -1) = 2 × 3 = 6. For n = 3, 23 – 1(23 – 1) = 22(8 – 1) = 4 × 7 = 28 For n = 5, 25 – 1(25 – 1) = 24(32 – 1) = 16 × 31 = 496

https://www.splashlearn.com / math-vocabulary / perfect-numbers

https://www.splashlearn.com / math-vocabulary / perfect-numbers
What Are Perfect Numbers? Definition, List, Formula, Examples – SplashLearn
A perfect number is defined as a positive integer that can be expressed as the sum of its proper factors (factors except for the number itself). Perfect number examples: 6, 28, 496. The factors of 6 are 1, 2, 3 and 6. We can write 6 = 1 + 2 + 3 . The smallest perfect number is 6. When the sum of all the divisors of a is equal to twice …

https://en.wikipedia.org/wiki/Perfect_number

https://en.wikipedia.org/wiki/Perfect_number
Perfect number – Wikipedia
In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number. The sum of divisors of a number, excluding the number itself, is called its aliquot sum, so a …

https://www.quantamagazine.org/the-mysterious-math-of-perfect-numbers-20210315

https://www.quantamagazine.org/the-mysterious-math-of-perfect-numbers-20210315
The Mysterious Math of Perfection | Quanta Magazine
Perfect numbers are equal to the sum of their proper divisors (positive integers that divide a number evenly, not counting itself). For example, 6 = 3 + 2 + 1, and 28 = 14 + 7 + 4 + 2 + 1.

https://testbook.com/maths/perfect-numbers

https://testbook.com/maths/perfect-numbers
Perfect Numbers: Definition, List from 1 to 100 & Solved Examples
7 juin 2023Make a list of all the numbers that divide a number except the number itself to find the perfect factors. The numbers 1, 2, 3, 6, and 9 are ideal factors for the number 18.

https://math.libretexts.org/Bookshelves/Combinatorics_and_Discrete_Mathematics/Elementary_Number_Theory_(Barrus_and_Clark)/01:_Chapters/1.16:_Perfect_Numbers_and_Mersenne_Primes

https://math.libretexts.org/Bookshelves/Combinatorics_and_Discrete_Mathematics/Elementary_Number_Theory_(Barrus_and_Clark)/01:_Chapters/1.16:_Perfect_Numbers_and_Mersenne_Primes
1.16: Perfect Numbers and Mersenne Primes – Mathematics LibreTexts
22 janv. 2022Definition 1.16.1: Perfect. An integer n > 1 is perfect if σ∗(n) = n; in other words, n is perfect if it equals the sum of its proper divisors. An equivalent way to define perfect numbers is as those numbers n for which σ(n) = 2n. Example 1.16.1. The proper divisors of 6 are 1, 2 and 3. So σ∗(6) = 6.

https://www.mathwarehouse.com/arithmetic-calculators/perfect-number-calculator.php

https://www.mathwarehouse.com/arithmetic-calculators/perfect-number-calculator.php
Perfect Number Calculator with Work/ Explanation – Mathwarehouse.com
Perfect Number Calculator. Directions: Enter any number and we will tell you if it is a perfect number or not, as you type. Back to Perfect Number Definition Next to All Perfect Numbers Calculated. Free Perfect Number Calculator. Shows the work and explains the answer.

https://study.com/learn/lesson/perfect-number-definition-examples-what-is-a-perfect-number.html

https://study.com/learn/lesson/perfect-number-definition-examples-what-is-a-perfect-number.html
Perfect Number Definition & Examples – Study.com
21 nov. 2023For example, the number 6 is considered a perfect number. Its divisors are 1, 2, and 3. Adding together 1+2+3, one finds that the sum is equal to the original number: 6. Thus, six is considered a …

https://www.geeksforgeeks.org/perfect-number

https://www.geeksforgeeks.org/perfect-number
Perfect Number – GeeksforGeeks
20 déc. 2022A number is a perfect number if is equal to sum of its proper divisors, that is, sum of its positive divisors excluding the number itself. Write a function to check if a given number is perfect or not. Examples: Input: n = 15 Output: false Divisors of 15 are 1, 3 and 5. Sum of divisors is 9 which is not equal to 15. lesoutrali bot