This is the series of the smallest numbers evenly divisible by the ascending sequence numbers from 1 to 1..8.
1 is divisible by 1
2 by 1 & 2
6 by 1, 2 & 3 or 1..3 (6 can also be divided by itself, but this isn't relevant because itis not divisible by 4 or 5.)
12 by 1..4
60 by 1..6
420 by 1..7
840 by 1..8
The required number is smallest number that is divisible by 1..9, which is 2520 that is also divisible by 10
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