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Just 3 digits (Posted on 2018-05-17) Difficulty: 4 of 5
A 10-digit number 2404563210 has an interesting feature: reading from left to right - any k-digit string is divisible by k.
No big deal ! IMHO there are 2492 numbers like that.

At least one of them utilizes only 3 distinct digits.

Find this number.

See The Solution Submitted by Ady TZIDON    
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I came up with | Comment 1 of 4
444402000
I used some helpful rules about divisibility by small integers, but no computer. It took about 15 minutes.

  Posted by FrankM on 2018-05-17 12:26:09
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