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Q: What numbers contain 3 5 and 7 as factors and are less than 400?

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The prime numbers less than 100 that contain an 8 are 83 and 89. So, there are two prime numbers that are less than 100 and contain an 8.

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The prime numbers less than 13 have the fewest factors. They are:235711

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Nine numbers.

The ones with less than three factors.

There are a few numbers that are less than 19 and have more than 4 factors. The number 10 is less than 19 and has more than four factors.

All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.

If the two numbers have no prime factors in common, their LCM will be their product. If there are prime factors in common, their LCM will be less than their product.

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Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.

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