Can an odd number be a perfect number?

Can an odd number be a perfect number?

It is unknown whether any odd perfect numbers exist, though various results have been obtained. In 1496, Jacques Lefèvre stated that Euclid’s rule gives all perfect numbers, thus implying that no odd perfect number exists.

What is the formula for perfect numbers?

A Perfect Number “n”, is a positive integer which is equal to the sum of its factors, excluding “n” itself. Euclid, over two thousand years ago, showed that all even perfect numbers can be represented by, N = 2p-1(2p -1) where p is a prime for which 2p -1 is a Mersenne prime.

WHY IS 496 a perfect number?

Now, the sum of divisors of a number, excluding the number itself, is called its aliquot sum, so we can define a perfect number as one that is equal to its aliquot sum. Hence, the sum of these factors is equal to the given number. So, 496 is a perfect number.

What are odd perfect numbers?

The Form of Odd Perfect Numbers In other words, an odd perfect number must be a perfect square times a specific type of prime number to a specific type of power (1, 5, 9, …). You can plug in numbers to get a feel for this. If n is 1, then the prime p=5. If Q is 3, then the perfect square is 9.

What is known about odd perfect numbers?

In 1887, Sylvester conjectured and in 1925, Gradshtein proved that any odd perfect number must have at least six distinct prime factors (Ball and Coxeter 1987). Hagis (1980) showed that odd perfect numbers must have at least eight distinct prime factors, in which case, the number is divisible by 15 (Voight 2003).

What is example of perfect number?

perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128. The discovery of such numbers is lost in prehistory.

Why is 7 a perfect number?

Seven is the number of completeness and perfection (both physical and spiritual). It derives much of its meaning from being tied directly to God’s creation of all things. The word ‘created’ is used 7 times describing God’s creative work (Genesis 1:1, 21, 27 three times; 2:3; 2:4).