# [Jelly], 2 bytes RS ## Explanation RS implicit input S sum of the... R inclusive range [1..input] implicit output [Try it online!][TIO-j5a1rxes] ## Gauss sum, 3 bytes ‘×H ### Explanation ‘×H implicit input H half of the quantity of... ‘ input + 1... × times input implicit output [Jelly]: https://github.com/DennisMitchell/jelly [TIO-j5a1rxes]: https://tio.run/##y0rNyan8/z8o@P///6YA "Jelly – Try It Online"