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There are three prime numbers: 47, 53, 59.
The smallest three-digit number divisible by the first three prime numbers (2, 3, and 5) and the first three composite numbers (4, 6, and 8) is 120.
225 cannot be factorised into the product of only 3 prime numbers.
Numbers 3.5 and 11. The numbers are actually prime factors of 165 (165=3*5*11).
Numbers with exactly three factors are squares of prime numbers.