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Can a perfect number be odd?
If by 'perfect number' you mean 'perfect SQUARE', then yes. 49 is an odd number and a perfect square.
What is a number that is odd and it's a perfect number?
It is unknown whether an odd perfect number actually exists. If an odd perfect number exists it will be extremely large, that is in excess of 10300.
What is the largest form of odd number using 4709?
The largest odd number that can be made with those digits is 9407 .
What is the largest and the smallest odd number?
3 and and any number with the ones digit that is odd The smallest odd number is ' 1 '. There's no such thing as the 'largest' one. Whatever odd number you name, no matter how large it is, all I have to do is add 2 to your number, and I can always come up with a larger odd number.
Is 7 the only perfect number on the form xn yn?
No. Because 7 is not even a perfect number; it is conjectured (not proven) that there are no odd perfect numbers only even ones and 7 is an odd number - it has been proven that if there is an odd perfect number it has to be extremely large, much-much-much larger than 7)
