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Digit Anagram (Posted on 2019-01-24) Difficulty: 4 of 5
Let n be a positive integer such that 2n-1 is a digit anagram of n (in its decimal representation). An example of such a pair would be n=37, 2n-1=73.

Show that if n's least significant digit is 3, n must also contain an 8.

No Solution Yet Submitted by Danish Ahmed Khan    
Rating: 5.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Question re: some examples-- FORCE A QUESTION Comment 3 of 3 |
(In reply to some examples--for what they're worth by Charlie)

Why digit 2 never appears in n and 2n-1   ?
  Posted by Ady TZIDON on 2019-01-26 03:33:33

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