define Perfect number.
give 2 examples
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A positive integer that is equal to the sum of its proper divisor . the smallest perfect no. is 6 which is the sum of 1, 2, 3 . other perfect nos. are 28 ,496.
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★ perfect numbers ★
is a positive integer that is equals to the sum of it's proper positive divisors that is, the sum of its positive divisors excluding the number itself.
★ for example ★
The factors of 28 are 1, 2, 4, 7, 14 and 28.
1 + 2 + 4 + 7 + 14 = 28.
similarly, The factors of 6 are 1, 2, 3 and 6.
1 + 2 + 3 = 6.
is a positive integer that is equals to the sum of it's proper positive divisors that is, the sum of its positive divisors excluding the number itself.
★ for example ★
The factors of 28 are 1, 2, 4, 7, 14 and 28.
1 + 2 + 4 + 7 + 14 = 28.
similarly, The factors of 6 are 1, 2, 3 and 6.
1 + 2 + 3 = 6.
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