You are looking for the prime factorization of 42. Since 42 is definetely even, we conduct a test on the divisibility of 3 first. 4 + 2 = 6, and 6 mod 3 = 0. Therefore, it is divisible by 6. 6 factors to 3 and 2, and when 42/6 = 7, which is a prime. Therefore, the product is: 3 * 2 * 7.
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That's an infinite list that includes 30, 42 and 66.
30, 42, 66, 70, 78
All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.
30, 42, 66, 70, 78