The sum of the first 800 consecutive numbers is 320,400.
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The two square numbers are 72 + 62 = 49 + 36 = 85. The smaller number is therefore 6.
807
The sum of the first 40 whole numbers is 780.
The sum of the first 1,000 odd numbers is 1,000,000.
The sum of the first 50 even numbers is 2,550.