# Relationship between mersenne primes and perfect numbers

### Even Perfect Numbers and Mersenne Prime Numbers – Problems in Mathematics The Euclid–Euler theorem is a theorem in mathematics that relates perfect numbers to Mersenne primes. It states that every even perfect number has the form 2n − 1(2n − 1), where 2n − 1 is a prime number. The prime numbers of the form 2n − 1 are known as Mersenne primes, and relationship between even perfect numbers and Mersenne primes; each. Perfect Numbers, Mersenne Primes, and the Euclid-Euler Theorem. Thomas Browning. May We say N is perfect when the sum of all of the factors of N. After reading this, and how rare perfect numbers are, I wanted to try and devise a method of generating perfect numbers from Mersenne primes. His next entry, 31, was correct, but the list then became largely incorrect, as Mersenne mistakenly included M67 and M which are composite and omitted M61, M89, and M which are prime.

Mersenne gave little indication how he came up with his list. This was the largest known prime number for 75 years, and the largest ever found by hand. M61 was determined to be prime in by Ivan Mikheevich Pervushinthough Mersenne claimed it was composite, and for this reason it is sometimes called Pervushin's number.

### Mersenne prime - Wikipedia

This was the second-largest known prime number, and it remained so until Lucas had shown another error in Mersenne's list in Without finding a factor, Lucas demonstrated that M67 is actually composite.

No factor was found until a famous talk by Frank Nelson Cole in Searching for Mersenne primes[ edit ] Fast algorithms for finding Mersenne primes are available, and as of [update] the seven largest known prime numbers are Mersenne primes.

Perfect Number Proof - Numberphile

After nearly two centuries, M31 was verified to be prime by Leonhard Euler in Two more M89 and M were found early in the 20th century, by R. Powers in andrespectively. The best method presently known for testing the primality of Mersenne numbers is the Lucas—Lehmer primality test.

### Perfect Numbers & Mersenne Primes | gtfd.info

During the era of manual calculation, all the exponents up to and including were tested with the Lucas—Lehmer test and found to be composite. A notable contribution was made by retired Yale physics professor Horace Scudder Uhler, who did the calculations for exponents,and Graph of number of digits in largest known Mersenne prime by year — electronic era. Although computers facilitate searches for prime numbers and perfect numbers, fundamental number theory is still very relevant. In this lesson we explore how a particular type of prime number, the Mersenne prime, relates to perfect numbers. Playing With Perfect Numbers Searching for perfect numbers and prime numbers began thousands of years ago and continues to this day. Perfect numbers and prime numbers are uniquely defined by their divisors.

Some of the prime numbers discovered are Mersenne primes.

## Perfect Numbers & Mersenne Primes

These primes are linked to powers of 2. In this lesson we explore Mersenne primes and their fascinating relationship with perfect numbers. Just for fun, add the divisors of 6 not including the 6. Adding 1 plus 2 plus 3 gives 6. Six is the starting number and 6 is the sum.

## Euclid–Euler theorem

Six is a perfect number where the sum of the divisors not including the number itself equals the number. What about the number 8? First, find the divisors of 8. The divisors of 8 are 1, 2, 4 and 8. Is 8 a perfect number? Thus, 8 is not a perfect number. The divisors of 3 are 1 and 3. Not a perfect number either but 3 is a prime number, in that it has only two divisors: Could a prime number ever be a perfect number?

What is the divisor sum if the number is a prime number? Right, always a 1. Thus, none of the prime numbers are perfect numbers.