1+1+1+1+1+=5
* * * * *
The question did not ask for the sum of the first counting number five times!
The sum of the first 5 counting numbers is 1+2+3+4+5 = 15.
Such sums are known as triangular numbers.
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Counting 0 as a number, it's 20. Not counting 0, it's 30.
The sum of the first 1,000 counting numbers (which excludes zero) is 500,001.
They are 1, 2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15 and 16.
The sum of the first 100 even numbers is 10,100
The sum of all the first 100 even numbers is 10,100.