Here it is: 500,001
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The sum of the first 10 natural numbers is 51, with an average of 5.1
The sum of the first 57 natural numbers is 1,625.
50.5
The sum of the first 10 natural numbers is 51.
The sum of the first n natural numbers is n*(n+1)/2 There are n numbers so their mean = (n+1)/2