Saturday, February 4, 2017

The prime fundamental adds up to 28............

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Perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128.Mar 12, 2004

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Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6. The next perfect number is 28 = 1 + 2 + 4 + 7 + 14. This is followed by the perfect numbers 496 and 8128 (sequence A000396 in OEIS).

Perfect number - Wikipedia, the free encyclopedia

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Perfect number is a number which is equal to sum of its divisor. For eg,divisors of 6 are 1,2 and 3. The sum of these divisors is 6. So 6 is called as perfect number. Here is source code of the C Program to check whether a given number is perfect number.

C Program to Check whether a given Number is Perfect Number

www.sanfoundry.com/c-program-perfect-number/
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A perfect number is defined to be one which is equal to the sum of its aliquot parts. The four perfect numbers 6, 28, 496 and 8128 seem to have been known from ancient times and there is no record of these discoveries.

Perfect numbers

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Search for: What are the 3 perfect numbers below 500?
In number theory, a deficient or deficient number is a number n for which the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n)<n. The value 2n − σ(n) (or n − s(n)) is called the number's deficiency.

Deficient number - Wikipedia, the free encyclopedia

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Perfect number - Wikipedia

https://en.wikipedia.org/wiki/Perfect_number
In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum).
‎List of perfect numbers · ‎Superperfect number · ‎Euclid–Euler theorem
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