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The Last Three Digits (Posted on 2007-08-28)

A number and its square both have the same last three digits. What are the possibilities for those digits?

See The Solution Submitted by Brian Smith

Rating: 4.0000 (3 votes)

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Puzzle Thoughts

Comment 9 of 9 |

These are called Automorphic numbers: m^2 ends with m and a fuller list that involves numbers whose squares contain same last m digits is found in A00322 in Sloane's Online Encyclopedia of Integer Sequences.

Posted by K Sengupta on 2022-12-21 10:14:38

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