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.
Great minds think alike.
Which doors are open?
Back to basics 1 - Saving
Angle between two vectors
Change the sign of even index entries of the reversed vector
Is this triangle right-angled?
Find the first N zeros of the 666 function
Whole Number Concatenator
Filter British English into American English
Whole Number Un-Concatenator
Airline Ticket Mod7 Checksum
Find the treasures in MATLAB Central and discover how the community can help you!
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Contact your local office