0
1
4
9
16
25
36
49
64
81
100
121
144
169
196
225
256
289
324
361
400
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The above numbers are squares not perfect numbers. A perfect number n is one that is equal to the proper divisors of n. Here are the first few:
6
28
496
8128
33550336
8589869056
137438691328
2305843008139952128
2658455991569831744654692615953842176
191561942608236107294793378084303638130997321548169216
I don't know if more of them are known. For more information see oeis.org.
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What are the perfect numbers between 1 and 20?
Just 6
What are the first 20 odd numbers?
The first 20 odd numbers are: 13579111315171921232527293133353739.
How many numbers between 20 and 30 are perfect square?
4
Is 495 a perfect number?
No, it isn't. In fact, it is not known whether are odd perfect numbers exist. The first perfect numbers are 6, 28, 496, and 8128.
What are all the perfect numbers between 20 and 30?
only 28 bro
Is 20 a perfect number in math?
No. In the first hundred numbers, there are only two perfect numbers: 6, and 28.
Perfect numbers between 20 and 30?
There are no perfect numbers between 20 and 30. Perfect numbers are numbers that are equal to the sum of their proper divisors, excluding the number itself. The perfect numbers within this range would be 28, but that is incorrect as 28 is not a perfect number.
Is 20 a square number or not?
No. Square numbers (or perfect square numbers) are squares of integers. The perfect square numbers are 1, 4, 9, 16, 25, 36 ... 20 is not in the series.
How many perfect numbers are in between 20 and 50?
The only perfect number between 20 and 50 is 28.
What numbers are perfect?
6, 28, 496 and 8128 are the first four Perfect numbers.
How many numbers between 2 and 20 are perfect squares?
Three numbers.
Are any of the numbers from 2 to 5 perfect?
No. The first two "perfect numbers" are 6 and 28.
What are some other perfect numbers?
Other than what? The first perfect numbers are 6 and 28.
What are the perfect numbers between 1 and 20?
Just 6
What are the first 20 odd numbers?
The first 20 odd numbers are: 13579111315171921232527293133353739.
How many perfect square numbers between 1 to 1000 are?
There are 31 perfect square numbers between 1 and 1000 (including 1).
How many numbers between 20 and 30 are perfect square?
4
