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The four numbers are: 113, 131, 151 and 191.

For the product of the digits to be prime, the number must contain 2 ones - which greatly simplifies the exercise.

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โˆ™ 2009-10-22 12:05:22
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Q: What four 3-digit prime numbers less than 200 each have a prime number for the sum of their digits AND a prime number for the product of their digits?
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