u/jedbno

help

for context,

here is my solution:

11+20+...+2027

(2027-11)÷9 + 1 = 225

then i did a gaussian technique where you add the first term to the last term, second term to the second-last term, etc. to get a constant sum of sorts. afterwards, i multiplied that constant sum with the floor division quotient of 225 by 2. but we still have a middle term, that is, 1019(1013th number) which i added to the product. all in all, we get 229075.

are my calculations correct or is there a part where i went wrong?