Re: [math-fun] Puzzler

David Cantrell:

Considering that x could be 2, we can conclude that k must be at least 45. I don't know whether k be larger than 45 or not.

It is 72, I think, for x = 125. David Wilson:

I give you an arbitrary positive integer x > 0. You write down x, 2x, 3x, 4x, ..., kx in decimal. How large much k be to guarantee that every digit appears somewhere in your list, regardless of x?