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4 and 5 powered (Posted on 2019-04-12)

For some positive integer k both 4^k and 5^k start with the same digit x.

What are the possible values of x?

No Solution Yet Submitted by Danish Ahmed Khan

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Puzzle Answer

Comment 2 of 2 |

4 and 2 are the required possible values of X. The corresponding minimum values of k are 11 and 52.

*** Interesting puzzle. I hope that I will be able to posit an independent explanation of my own.

Posted by K Sengupta on 2022-06-04 22:16:01

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