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A positive number is called n-primable if it is divisible by  and each of its digits is a one-digit prime number. How many 3-primable positive integers are there that are less than 1000?

 Aug 16, 2021
 #1
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i got the answers! its 28

 Aug 16, 2021
 #2
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"and is divisible by ??", what?

 Aug 17, 2021

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