# What can be a function that take integers as input values,and give output as odd Numbers?

I want a function that can get input as integers and give result as odd numbers. for example if x=1,y=1 then (2,3) (3,5) (4,7) (5,9) (6,11) expressing y in terms of x.

If you plot the points in the $$xy$$-plane, you'll see that they lie on a straight line: $$y=2x-1 .$$