0
No. The proper divisors of 26 are 1,2, and 13 but 1+2+13 =16 which does not equal 26.
6 is perfect because is proper divisors are 1,2 ,3 and 1+2+3=6.
28 is perfect because its proper divisors are 1,2,4,7,14 and 1+2+4+7+14 = 28.
All known perfect numbers are of the form (2n-1)2n-1 where
2n-1 is a prime and such numbers are always even.
If n = 2, 22 - 1 = 3 which is prime so 3(2) is perfect
If n = 3, 23 -1 - 7 which is prime so 7(23-1) = 7(22) = 28 which is perfect .
If n = 4, 24 - 1 = 15 which is not prime so the formula does not give a perfect number.
Primes of the form 2n-1 are called Mersennes primes in honor of the mathematician who wrote about them first. See the related link if you want to see a list of known Mersennes primes.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
What is it called when a number has a whole number square root?
Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".
Is 77 a perfect number?
75 is not a Perfect number.
What is the fourth perfect number?
The fourth perfect number is 8128.
Is 12 a perfect number?
No, 12 is not a perfect number. It is abundant.
Is 7 a perfect number?
No. 6 is a perfect number, but not 7.
Is 723 a square number?
If you mean a perfect square, then no. It is between 26*26 and 27*27.
What are two facts about the number 25?
25 is a perfect square25 is the largest whole number that is less than 26
What is a two digit number that is a perfect square and a perfect cube?
64. 64 = 82 = 43 26 = (23)2 = (22)3 = 64.
Is 26 abundant perfect or deficient?
The factors of 26 are 1, 2, 13. And if you add them together (1+2+13) the answer is 16 which is less than 26 so it is an deficient number.
What number differs from a perfect square by 1 is even and is less than 30?
8, 10 24, 26
Is 26 a perfect square?
No.........
What is harry's lucky number?
His lucky numbers are 26 and 7 same as mine x were perfect for each other x
Is 8128 a perfect number?
There is a formula to calculate even perfect numbers, 2p-1(2p - 1) where p is a prime number. When p = 7 then 26(27 - 1) = 64 x 127 = 8128 So 8128 is the 4th perfect number. (The other three occur when p = 2, 3 and 5)
What is the sum of the first perfect number and the second perfect number?
The sum of the 1st perfect number and 2nd perfect number is. . . 34!
Can 26 be a perfect square root?
26 is be the square root of 676
What is it called when a number has a whole number square root?
Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".Then the number is called a "perfect square".
What is harry styles's lucky number?
His lucky numbers are 26 and 7 same as mine x were perfect for each other x
