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The sum of the first 200 natural numbers is 20,001.
The sum of the first 10 natural numbers is 51, with an average of 5.1
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.
123456789101112131415.
The sum of the first 57 natural numbers is 1,625.