23+21+19+17=80
63, 65, 67, 69 = 264 so there does not appear to be a solution in whole numbers!
The sum of the first 8,000 odd numbers 64,000,000.
The sum of the first 600 odd numbers is 360,000.
The sum of the first nine odd numbers is 81.
23+21+19+17=80
The idea here is to use the formula for the sum of an arithmetic series. In this case, the starting number is of course 1; the interval is 2.
63, 65, 67, 69 = 264 so there does not appear to be a solution in whole numbers!
The sum of the first 15 odd numbers is 225.
The sum of the first 300 odd numbers is 90,000
The sum of the first 40 odd numbers is 1,600.
The sum of the first 8,000 odd numbers 64,000,000.
The sum of the first 600 odd numbers is 360,000.
The sum of the first nine odd numbers is 81.
The sum of the first 1,000 odd numbers is 1,000,000.
The sum of the first 50 odd numbers is 2,500.
The sum of the first 13 odd numbers is 169.