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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: ( Back to comment list | You must be logged in to post comments.)
re: computer solution / OEIS Comment 2 of 2 |
(In reply to computer solution by Charlie)

There may be others but they would be beyond practical for a brute force program.

  Posted by Jer on 2017-03-25 17:18:15
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