Can i convert my K type bayonet mount Ricoh lenses to fit my nikon N65 SLR?

I have a richo K-R5 With lenses i really like but i bought a new N65 is there any way i can use the old lenses from my Ricoh on my n65 or am i better off just selling them?

Nope.

Camera systems are unique, especially Nikon and Canon.

The fact that Ricoh uses the patented Pentax lens mount is a business arrangement Ricoh made with Pentax. Sony just bought Minolta to enter into the digital camera field.

Just sell the old gear and start building your Nikon system. It will take a few years, but in the end of the day, you will have a fine camera system.

If you have one of those f/1.2 lenses, you might be better off selling the camera.

No, you can't. Even though nominally a Pentax bayonet mount, Ricoh K-R lens should not be used with current Pentax cameras.