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 Create this string (Posted on 2016-05-04)
The number N is a string of decimal digits in which every digit is a difference between two other digits.
Examples: 333012 is such a number. So is 1278990.

What is the smallest pandigital number that possesses the above feature?

 See The Solution Submitted by Ady TZIDON No Rating

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 re(2): Solution | Comment 5 of 6 |
(In reply to re: Solution by Ady TZIDON)

Ady, you may need to say more.  I came to a solution 10023456789 (your intended?) but did not post it once I saw tomarken's.

On reading the reasoning behind his solution 10234567899 I decided mine was wrong.  Why?  It says the difference must be between "two other digits."  So if there's a 9, it cannot be used in the difference that yields 9.  There must be another 9.

Your examples bear this out:  333012 has more than one 3 and 1278990 has more than one 9.  I figured this was why.

 Posted by Jer on 2016-05-04 21:07:23

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