Just 6
No, there are no known perfect numbers between 1 and 30. The only perfect numbers that have been discovered are 6, 28, 496, and 8128.
The square numbers between 1 and 20 are 1,4,9 and 16.
Two almost perfect numbers between 5 and 20 are 6 and 12. An almost perfect number is defined as a number that is one less than a perfect number; in this case, 6 is one less than the perfect number 7 (which is 1 + 2 + 4) and 12 is one less than 13 (which is 1 + 2 + 4 + 6). These numbers have a unique relationship with their divisors, making them intriguing in number theory.
All whole numbers between 1 and 400 (=20 square).
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There are 31 perfect square numbers between 1 and 1000 (including 1).
The two perfect numbers between 1 and 30 are: 6, 28
No, there are no known perfect numbers between 1 and 30. The only perfect numbers that have been discovered are 6, 28, 496, and 8128.
The square numbers between 1 and 20 are 1,4,9 and 16.
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.
Two almost perfect numbers between 5 and 20 are 6 and 12. An almost perfect number is defined as a number that is one less than a perfect number; in this case, 6 is one less than the perfect number 7 (which is 1 + 2 + 4) and 12 is one less than 13 (which is 1 + 2 + 4 + 6). These numbers have a unique relationship with their divisors, making them intriguing in number theory.
All whole numbers between 1 and 400 (=20 square).
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4
6 and 28
Perfect numbers have the form 2n-1(2n-1) where 2n-1 is a Mersenne prime. When a new Mersenne prime is discovered, so is a new perfect number.
There are 167960 9 digits combinations between numbers 1 and 20.