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The prime factorization of 1995, which is 3 × 5 × 7 × 19, uses each odd digit exactly once and 1995 is the smallest positive integer with this property. What is the next smallest?

 May 16, 2020
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I suppose it would be 13*5*7*19.

 

If we add 10 to any of the other factors it will be more than adding 10 to the 3, so I think the next is 8645.

 

If you don't understand anything feel free to ask.

 May 16, 2020

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