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Casting Out Zeros (Posted on 2013-07-25) Difficulty: 4 of 5
One may perform the following two operations on a natural number:

1.Multiply it by any natural number
2.Delete zeros in its decimal representation.

For any natural number n, can one perform a sequence of these operations that will transform n to a one-digit number?

No Solution Yet Submitted by Danish Ahmed Khan    
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Comments: ( You must be logged in to post comments.)
  Subject Author Date
Some Thoughtsre: good for 11 thru 999Charlie2013-07-26 13:09:00
Some Thoughtsgood for 11 thru 999Charlie2013-07-26 13:05:20
re: Godel strikes again --- 31 and 33Charlie2013-07-26 09:53:15
Godel strikes againSteve Herman2013-07-25 21:43:36
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