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The sum of all the numbers 1 through 200 is 20,100.
The sum of the all prime numbers from 1 to 100 is 1,161
The sum of all odd numbers 1 to 120,000 is 14,400,000,000.
The sum of all odd numbers 1 through 99 is 9,801.
The sum of all numbers between 1 and n = n*(n+1)/2 The sum of all numbers between 1 and 999 = 999*1000/2 = 499500 The sum of all numbers between 1 and 9999 = 9999*10000/2 = 49995000 So, the sum of all numbers between 1000 and 9999 = 49495500