60, 120, 180, 240, 300, 360, 420, 480, 540 . . .
60, 120, 180, 240, 300, 360, 420, 480, 540, 600.
The multiples of 120 are an infinite set that starts with 120, 240, 360, 480, 600, 720, 840, 960, 1080, 1200, and so on.
1/5 x 240 = 1/10 x 480 = 48
There are some multiples of 15 from 15 to 500! Here it is... 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375, 390, 405, 420, 435, 450, 465, 480, 495
120, 180, 240, 300, 360, 420, 480, 540 +60 . . .
60, 120, 180, 240, 300, 360, 420, 480, 540 . . .
60, 120, 180, 240, 300, 360, 420, 480 . . . ∞
60, 120, 180, 240, 300, 360, 420, 480, 540, 600
60, 120, 180, 240, 300, 360, 420, 480, 540, 600
The first 12 are: 60, 120, 180, 240, 300, 360, 420, 480, 540, 600, 660 . . .
60, 120, 180, 240, 300, 360, 420, 480, 540, 600.
60, 120, 180, 240, 300, 360, 420, 480, 540, 600
60, 120, 180, 240, 300, 360, 420, 480
60: 60, 120, 180, 240, 300, 360 420, 480, 540, 600, 660, 720, 780...
120, 240, 360, 480, 600, 720, 840 +120 . . .
60/120/180/240/300/360/420/480/540/600 etc.