Problem 2491. Dudeney Numbers: Numbers which are the cube of their decimal sum
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2 Comments
Alex Drikitis
on 14 Sep 2021
is there any negative dudeney number?
Dyuman Joshi
on 14 Sep 2021
Depends upon how you define them.
If you are taking - sign outside the cube of the sum, every negative number corresponding to the positive Dudeney number is a Dudeney number.
If you define by the way OP has defined, -1 qualifies as a Dudeney number.
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1 Comment
Jean-Marie Sainthillier
on 9 Aug 2014
Great minds think alike.
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