(idiomatic) To figure; to do the math.

plural of deficient number

alternative form of color by number / (rare) plural of color by number

alternative form of color by number

plural of Keith number

plural of repfigit number

(Firearms, on a bolt action rifle), corresponding serial numbers on both the removable bolt and the frame of the rifle.

plural of Cullen number

plural of ideal number

plural of hyperbolic number