Sum of the first 18 Odd Numbers

Free Sum of the First (n) Numbers Calculator - Determines the sum of the first (n)
* Whole Numbers
* Natural Numbers
* Even Numbers
* Odd Numbers
* Square Numbers
* Cube Numbers
* Fourth Power Numbers
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Sum of the first n whole numbers = n(n - 1)/2
Sum of the first n natural numbers = n(n - 1)/2
Sum of the first n even numbers = n(n - 1)
Sum of the first n odd numbers = n²
Sum of the first n square numbers = n(n + 1)(2n + 1)/6
Sum of the first n cube numbers = n²(n + 1)²/4
Sum of the first n fourth power numbers = n(n + 1)(2n + 1)(3n² + 3n - 1)/30

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