20*(20+1)/2 = 210
The sum of the first 1,000 integers (whole numbers) is 499,500.
The integers 2 and 10 have a product of 20 and a sum of 12.
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105625
20*(20+1)/2 = 210
The sum of the first four non-negative, consecutive, even integers is 20.
The sum of all integers from 1 to 20 inclusive is 210.
The sum of the first 250 integers is 31,125.
The sum of the first ten positive integers is: 55
The sum of the first 500 positive integers is: 125,250
The sum of the first 30 positive integers is: 465.
The sum of the first 1,000 integers (whole numbers) is 499,500.
The sum of the first 60 positive integers is 1830.
The integers are 18 and 20.
The sum of the first 200 positive integers is 19,900.
The sum of the first 201 positive integers is 20100 if you include 0 (i.e. from 0 to 200). If you sum the integers from 1 to 201 instead, the sum is 20301.