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Using its own digits (Posted on 2018-05-31) Difficulty: 3 of 5
a.What two-digit number equals the product of units' digit by the factorial of tens' digit?
b. What if a non-decimal system (base below ten) were allowed?

See The Solution Submitted by Ady TZIDON    
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spoiler | Comment 4 of 9 |
If the number is xy in base-b, then x=3, y=3p, b=5p works for any integer p>1.

  Posted by xdog on 2018-06-01 08:13:40
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