Problem 156. Parasitic numbers
Test whether the first input x is an n-parasitic number: http://en.wikipedia.org/wiki/Parasitic_number. ( n is the second input.)
Examples:
parasitic(128205,4) ---> true
parasitic(179487,4) ---> true
parasitic(179487,3) ---> false
Solution Stats
Problem Comments
-
5 Comments
might be best to add a test case to guard against test suite hacking
Far too few test cases. In fact, a serious issue with this problem is that there are too few parasitic numbers that will fit into even 64 bits for most values of n.
I've added some test cases, that will make it a bit more difficult to game this problem.
Cases 5 and 7 are identical, and I believe they are both wrong. 5 x 142857 = 714285. Isn't this a parasitic number? What am I missing?
Can the problem creator disqualify "solutions" that cheat? There should be a point penalty (-200) associated with cheating too.
Solution Comments
Show commentsProblem Recent Solvers293
Suggested Problems
-
Find the numeric mean of the prime numbers in a matrix.
8903 Solvers
-
10170 Solvers
-
Similar Triangles - find the height of the tree
298 Solvers
-
616 Solvers
-
Who is the smartest MATLAB programmer?
750 Solvers
More from this Author23
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!