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I dont know how to do this :/

from 1 to 4 add 3
from 4 to 8 add 4
from 8 to 13 add 5

next one would be \(13+6=19\)

then \(19+7=26\)

and finally \(26+8=34\)

well... that was really easy... i forgot to think a lil bit :/

there is probably a fancier way to do it, as this is a quadratic function of some kind

yw

actually the equation is not that easy to find
it is
\[\frac{x^2}{2}+\frac{x}{2}-1\]