The Pottawatomie County Sheriff's Office requested a Silver Alert Monday evening for Donald Brann, 89.
The white male was last seen Saturday afternoon in Tecumseh and was wearing bluish pajama bottoms, a white T-Shirt and a gray jacket with name and motorcycle.
He has memory issues and is also easily confused. He is driving a 2006 Chevrolet HHR 4-door, EIQ679.
Anyone with information should call police.