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1 is one of them (Posted on 2017-03-25) Difficulty: 4 of 5
There are 3 known numbers that are repunits at least in four bases.

1. The title mentions one of them.
2. Please find the other two without referring to Google, OEIS et al.
3. Limit your search up to 9999.
4. Looking for the "fourth" would be exercise in futility.

No Solution Yet Submitted by Ady TZIDON    
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Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: computer solution / OEISJer2017-03-25 17:18:15
Solutioncomputer solutionCharlie2017-03-25 14:51:18
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