Question

1. Write a Python program to print all Perfect numbers between 1 to n. (Use any loop you want)

Perfect number is a positive integer which is equal to the sum of its proper positive divisors.

Proper divisors of 6 are 1, 2, 3.

Sum of its proper divisors = 1 + 2 + 3 = 6.

Hence 6 is a perfect number.

*** proper divisor means the remainder will be 0 when divided by that number.

Sample Input: n = 1000;

Sample Output: 6, 28, 496

Answer 1

def divisors(n):
    s = 1
    for x in range(2,n):
        if(n%x == 0):
            s += x
    return s

def isperfect(n):
    if(divisors(n) == n):
        return True
    else:
        return False

#Testing
def main():
    n = int(input("n = "))
    lst = []
    for i in range(2,n+1):
        if(isperfect(i)):
            lst.append(i)
    print(str(lst)[1:-1])

main()

n = 1000
6, 28, 496