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Unique definition (Posted on 2018-05-07) Difficulty: 2 of 5
What is the only 2-digit number that is one less than twice its reverse?

No Solution Yet Submitted by Ady TZIDON    
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Solution 2-digit and beyond Comment 1 of 1
73 = 2*37-1

793 = 2*397-1

7993 = 2*3997-1

10^(n+1) - 2*10^n - 7 = 2[10^(n+1) - 6*10^n - 3] -1

  Posted by Jer on 2018-05-07 09:54:32
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