Yes
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 . . .
-27
1 2 3 5 6 9 10 15 18 30 45
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99.
Anything that isn't 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99 and so on.
1, 3, 5, 9, 15, 45 are the factors of 45.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99
63
5 & 9. 5 + 9 = 14... 5 x 9 = 45.
45 = 1 x 45, 3 x 15, 5 x 9
-41
27