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Perfect numbers are numbers where all the factors add to that number. For example 6's factors are 1,2, and 3 and 1+2+3=6. Therefore the next perfect number isn't until 28 which is 1,2, 4, 7, 14 where 1+2+4+7+14= 28
An almost perfect number is a number which, when adding all of its proper divisors (all divisors except himself), gives you one less, or one more then the number itlself. Up to now all known almost perfect numbers are 2^n. So to answer your question, the 2 almost perfect numbers between 5 and 20 are 8 and 16.
Divisors of 8: 1,2,4 -----> 1+2+4=7
Divisors of 16: 1,2,4,8 -----> 1+2+4+8=15
6 and 5
15 and 6
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How many perfect numbers are in between 20 and 50?
The only perfect number between 20 and 50 is 28.
How many perfect square numbers between 1 to 1000 are?
There are 31 perfect square numbers between 1 and 1000 (including 1).
What are 4 perfect square numbers between 20 and 70?
25, 36, 49, 64
How many odd numbers are between 20 and 158?
There are 69 odd numbers between 20 and 158.
How many odd numbers are between 20 and 100?
There are 40 odd numbers between 20 and 100. Remember that an odd number is every second number. There are 80 numbers between 20 and 100, so there are 40 odd numbers and 40 even numbers.
What are the two numbers between 5 and 20 that are almost perfect.?
7 17
How many perfect numbers are in between 20 and 50?
The only perfect number between 20 and 50 is 28.
How many numbers between 2 and 20 are perfect squares?
Three numbers.
What are the perfect numbers between 1 and 20?
Just 6
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.
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
What are all the perfect numbers between 20 and 30?
only 28 bro
What are 2 perfect numbers between 5 and 20?
The only two are 9 and 16.
Is 20 a perfect number in math?
No. In the first hundred numbers, there are only two perfect numbers: 6, and 28.
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.
What are the ratings and certificates for Even Stevens - 1999 Almost Perfect 1-20?
Even Stevens - 1999 Almost Perfect 1-20 is rated/received certificates of: Australia:G
