The sum of the first 200 natural numbers is 20,001.
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20100
The sum of the squares of the first 100 natural numbers [1..100] is 338350, while the sum of the first 100 natural numbers squared is 25502500.
1166650
The sum of all the numbers 1 through 200 is 20,100.
Look up Gauss' Formula if you want to know how to calculate this. If you just want the answer, it's 20100.