Productive Moving Digits
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What is the smallest number which is quadrupled when its last digit is
moved to be its first? Find all such numbers less than one million.
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What is the smallest number which is tripled when its first digit is
moved to be its last? Find all such numbers less than one million.
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What is the smallest number which becomes five times greater when
its last digit is moved to be its first?
Find all such numbers less than one million.
Source: Martin Gardner's Dr. Matrix, with original embellishments,
Used as Ken's POTD 4/20/94.
Solution
Mail to Ken