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An integer is a perfect number if it is equal to the sum of its positive divisors, not including the number itself.
The divisors of 28 are : 1, 2, 4, 7 and 14....and these sum to 28. Thus 28 is a perfect number.
In Number Theory there is a theorem that, If 2k - 1 is prime then 2k-1(2k - 1) is perfect.
If we put k = 3 then 2k - 1 = 23 - 1 = 8 - 1 = 7 is prime.
And, 23-1 (23 - 1) = 22(8 - 1) = 4 x 7 = 28....is the resultant perfect number.
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What is an example of a near-perfect number?
an example of a near perfect number is 2, 4 or 16.-these are near-perfect numbers because their factors add up to one less than the number itself.
Is 22 a perfect number or a near number?
22 is not a perfect number but 6, 28, 496 and 8128 are perfect numbers.
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Why is theta a good approximation for sine theta if theta is near zero?
near zero
