Re: [math-fun] prime ladders

9973 -> 1973 -> 1913 -> 1013 -> 1019 -> 1009 9973 -> 1973 -> 1933 -> 1033 -> 1039 -> 1009 9973 -> 1973 -> 1979 -> 1949 -> 1049 -> 1009 9973 -> 9173 -> 9103 -> 1103 -> 1109 -> 1009 9973 -> 9173 -> 9103 -> 9109 -> 1109 -> 1009 Warut On Mon, Mar 9, 2009 at 10:30 AM, <rcs@xmission.com> wrote:

The Prime Ladder puzzle is to change one prime into another, by changing a digit at a time.  All the intermediate numbers must also be prime.

Example:  101 into 997:  101 -> 107 -> 197 -> 997

Challenge: Change 1009 into 9973.

Rich

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