4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400
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6 and 28 are perfect numbers.
81. They are the perfect squares of numbers starting from 5.81. They are the perfect squares of numbers starting from 5.81. They are the perfect squares of numbers starting from 5.81. They are the perfect squares of numbers starting from 5.
6, 28, 496 and 8128 are the first four Perfect numbers.
By definition, ALL perfect squares are whole numbers!
There is no way to determine the amount of perfect numbers there are. The number could be infinite, but this has yet to be proven. It has also yet to be proven if there are any odd perfect numbers.