2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 27, 71, 73, 79, 83, 89, 97 RULE: remainders must be non-negative

Algebra is faster than picking numbers bro:

15 = (x + y) + y - 3

18 = xy + y

18 = y (x + 1)

therefore, y must be a factor of 18, so y could be 1, 2, 3, 6, 9, or 18. remainder must be non-negative so y must be 3, 6, 9, or 18 (y - 3 doesn't work with 1 or 2). ;