201
Numbers divisible by 300, such as 600, 900, 1200....
Their sum is 1200.
400 800 1200 multiples of 4
The first 15 multiples of 1200: 1200, 2400, 3600, 4800, 6000, 7200, 8400, 9600, 10800, 12000, 13200, 14400, 15600, 16800, 18000 . . .
multiples of 400: 400, 800, 1200, 1600, 2000, 2400, ...
3600
It is: 1200
120, 1200, 12000, 120000 and 1200000000000 are all multiples of 12.
As long as one of the numbers is 12, the other 2 can be any other multiples of 12. 12, 1200, 12000
The multiples of 300 (which are infinite) are all divisible by 300, including these: 300, 600, 900, 1200, 1500, 1800, 2100, 2400, 2700 . . .
All numbers have an infinite amount of multiples.
12,24,36,48,60,72,84,96 That's it.