That tells you the sum of all integers from 1 to 1 million. It doesn't give you the sum of all the digits in those numbers. To illustrate the difference: The sum of all numbers from 1 to 15 is 105 (1 + 2 + 3...+15) The sum of all digits in those numbers is 66 (1 + 2 + 3...+ (1 + 0)... + (1+ 5)) -Beth