The sum of the whole numbers 1 through 1,000 is 500,500.
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It is 1000*(1000+1)/2 = 500500
The sum of 1 through 250 is 31,375.
The sum of the numbers from 1 through 100 is 5,050.
The sum of the numbers 1 through 27 is 378.
The sum of the prime numbers between 1 and 1,000 (2-999) is 76,127.