Incongruous numbers

(Arith.) two numbers, which, with respect to a third, are such that their difference can not be divided by it without a remainder, the two numbers being said to be incongruous with respect to the third; as, twenty and twenty-five are incongruous with respect to four.

See also: Incongruous

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.