There are 3 factor pairs of 18:
18 = 1 x 18
18 = 2 x 9
18 = 3 x 6
The factor pairs for 18 are (1,18), (2,9), (3,6)
18 is a single number. The factor pairs of 18 are (18,1)(9,2)(6,3)
18,19,26,3
factor pair = 50,1factor pair = 25,2factor pair = 10,5
factor pair = 268,1factor pair = 134,2factor pair = 67,4
factor pair = 110,1factor pair = 55,2factor pair = 22,5factor pair = 11,10
factor pair = 36,1factor pair = 18,2factor pair = 12,3factor pair = 9,4factor pair = 6,6
(1, 18) (2, 9) (3, 6)
factor pair = 45,1factor pair = 15,3factor pair = 9,5
factor pair = 580,1factor pair = 290,2factor pair = 145,4factor pair = 116,5factor pair = 58,10factor pair = 29,20
factor pair = 1512,1 factor pair = 756,2 factor pair = 504,3 factor pair = 378,4 factor pair = 252,6 factor pair = 216,7 factor pair = 189,8 factor pair = 168,9 factor pair = 126,12 factor pair = 108,14 factor pair = 84,18 factor pair = 72,21 factor pair = 63,24 factor pair = 56,27 factor pair = 54,28 factor pair = 42,36
factor pair = 324,1factor pair = 162,2factor pair = 108,3factor pair = 81,4factor pair = 54,6factor pair = 36,9factor pair = 27,12factor pair = 18,18