Sum of squares of n natural numbers in python

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Given a positive integer N. The task is to find 12 + 22 + 32 + ….. + N2.

Examples:

Input : N = 4
Output : 30
12 + 22 + 32 + 42
= 1 + 4 + 9 + 16
= 30

Input : N = 5
Output : 55

Method 1: O[N] The idea is to run a loop from 1 to n and for each i, 1