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1=1*1 (prime)
2=2*1 (prime)
3=3*1 (prime)
4=2*2
5=5*1 (prime)
6=3*2
7=7*1 (prime)
8=2*2*2
9=3*3
Start with primes:
1*2*3*5*7
Go through the rest:
4=2*2 (add *2 --> 1*2*2*3*5*7)
6=3*2 (already covered 1*2*2*3*5*7)
8=2*2*2 (add *2 --> 1*2*2*2*3*5*7)
9=3*3 (add *3 --> 1*2*2*2*3*3*5*7)
Calculate
1*2*2*2*3*3*5*7=
1*8*9*5*7=
72*35=2520
The smallest number divisible by first four prime numbers is 2x3x5x7 = 210.
4 is the smallest composite number and it is not divisible by the two given numbers.
The smallest whole number divisible by both 8 and 12 is 24.
The first three prime numbers are 2,3,5. The smallest number divisible by 2,3 and 5 is 30 (2*3*5).
1260