Hi,
this (pure) function tests whether a particular number is coprime to 35 and smaller than 20.
CoprimeQ[35, #] && # < 20 &
You can apply this to all function in a certain range:
Select[Range[-100, 100], CoprimeQ[35, #] && # < 20 &]
Of course this is not quite necessary, because technically we can add the range restriction in the first place to the input:
Select[Range[-100, 19], CoprimeQ[35, #] &]
gives the same as above.
Cheers,
Marco
