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.
9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 99
63
5 & 9. 5 + 9 = 14... 5 x 9 = 45.
1, 3, 5, 9, 15, 45 are the factors of 45.
-41
45 = 1 x 45, 3 x 15, 5 x 9
-49