What are the possible values of a six digit positive integer N, where all digits of N are different, and 4*N has the same six digits as N?

Prove that there are no others.

(In reply to re: Let me count the ways by Steve Herman)

Big minds think alike.

We wrote the same thing at the same time.

Posted by Ady TZIDON on 2014-03-26 13:44:26