perplexus.info :: Numbers : 1 is one of them

1 is one of them (Posted on 2017-03-25)

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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re: computer solution / OEIS

Comment 2 of 2 |

(In reply to computer solution by Charlie)

https://oeis.org/A119598

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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