The Vivitar Series 1 35-85 is available in M42 mount. It's big and heavy, and it's not a true zoom. It's a variable focus lens -- you must refocus the lens as you zoom. In use, it works just like a zoom.
It has a maximum aperture of f/2.8 through its zoom range, which explains why it's so big and heavy. To achieve this maximum aperture required a very large front element at the time it was available in the 1970s.