Find the Sum of First N Odd Numbers in Python

Suppose we have one number n, we have to find the sum of the first n positive odd numbers.

So, if the input is like 7, then the output will be 49 as [1+3+5+7+9+11+13] = 49

To solve this, we will follow these steps −

• if n is same as 0, then
  • return 0
• sum := 1, count := 0, temp := 1
• while count < n-1, do
  • temp := temp + 2
  • sum := sum + temp
  • count := count + 1
• return sum

Let us see the following implementation to get better understanding −

Example

 Live Demo

class Solution:    def solve(self, n):       if n == 0:          return 0          sum = 1          count = 0          temp = 1          while(count<n-1):             temp += 2             sum += temp             count += 1          return sum ob = Solution() print(ob.solve(7))

Input

7

Output

49