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How to calculate the sum of 1! + 2! + 3! + ... + N!

📁 Advanced Python Topics, AI

Problem condition:

For a given natural n, calculate the sum of 1! + 2! + 3! + ... + n!. Only one loop can be used to solve this problem. The use of the math library is forbidden.


n = int(input())
n = 1
sum = 0
for a in range(1, n+1):
    for b in range(1, a+1):
        n = n * b
    sum += n

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How to calculate the sum of 1! + 2! + 3! + ... + N!

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