From Wikipedia: A Dudeney number is a positive integer that is a perfect cube such that the sum of its decimal digits is equal to the cube root of the number.
For example:
512=(5+1+2)^3
4913=(4+9+1+3)^3
19683=(1+9+6+8+3)^3
Write a function that returns true if a number is a Dudeney number and false otherwise.
Assume all numbers are of base 10.
If a number is negative, assume that only the leading digit carries the negative sign e.g. -4913 -> (-4+9+1+3)^3
Solution Stats
Problem Comments
2 Comments
Solution Comments
Show comments
Loading...
Problem Recent Solvers77
Suggested Problems
-
1777 Solvers
-
All your base are belong to us
574 Solvers
-
244 Solvers
-
The sum of the numbers in the vector
640 Solvers
-
211 Solvers
More from this Author9
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
is there any negative dudeney number?
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.