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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.
What else can I help you with?
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.
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.
What is the fourth perfect number?
The fourth perfect number is 8128.
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)
Is 26 a perfect square and why?
No, 26 is not a perfect square because there is no integer that, when multiplied by itself, equals 26. The perfect squares closest to 26 are 25 (5^2) and 36 (6^2), indicating that 26 falls between these two values. Thus, it cannot be expressed as the square of an integer.
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!
What is harry styles's lucky number?
His lucky numbers are 26 and 7 same as mine x were perfect for each other x
Can 26 be a perfect square root?
26 is be the square root of 676
