A near- or almost-perfect number refers to a natural number n where the sum of its divisors is equal to 2n - 1. In this instance, the sum of the divisors is equal to 16 + 8 + 4 + 2 + 1 = 31 - one...
A perfect number is a number, which, when adding all of its proper divisors (all divisors except himself) give the number itself Divisors of 6: 1,2,3 ------>1+2+3=6The next proper number is...
Almost perfect numbers refer to numbers where σ(x) = 2x - 1, where σ is the sum of divisors function. Any number in the form 2n is almost perfect becauseσ(2n) = 1 + 2 + 4 + ... + 2n = 2n+1-1 =...