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What does "no digit may be composite" mean, that all the digits have to be prime numbers?

If so, then 9 is composite, and 8 is composite, but 7 is prime, so the (trivial) answer is 777777. Any other number meeting the criteria given is smaller.

This is so glaringly obvious that I can't help thinking you meant something else. You might want to ask again, but be more specific next time.

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Q: What is the largest six digit number no digit may be composite?
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