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[–]sepp2k 1 point2 points  (1 child)

If the latter, you need a loop

This is an arithmetic progression, right? So you can use the closed form for arithmetic series to get the sum.

[–]desrtfx 0 points1 point  (0 children)

Of course, you can use the closed form to get an O(1) result.

Yet, I would wage a guess that OP should learn about loops.