Problem 166. Kaprekar numbers
By solving this problem, you will make progress in the following group(s)
Magic Numbers
- 19 Problems
- 84 Finishers
Number theory
- 44 Problems
- 21 Finishers
Test if the input is a Kaprekar number: http://mathworld.wolfram.com/KaprekarNumber.html. Return a logical true or false.
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Problem Comments
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2 Comments
Raihan Ahmed
on 19 Nov 2015
Superb Problem
Jonathan Cratter
on 2 Dec 2018
nnnnn
Solution Comments
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Number theory
- 44 Problems
- 21 Finishers
- Pseudo-vampire number
- Pell numbers
- Frugal number
- Be happy
- Bell Triangle
- find nth even fibonacci number
- Cantor counting
- check whether a number is a pentatope number
- generate nth pentatope number
- Fangs of a vampire number
- Find all vampire fangs
- Balanced number
- Mandelbrot Numbers
- Parasitic numbers
- Woodall number
- Kaprekar numbers
- Project Euler: Problem 4, Palindromic numbers
- Fangs of pseudo-vampire number
- Project Euler: Problem 9, Pythagorean numbers
- Mersenne Primes
- Sophie Germain prime
- Determine if input is a Narcissistic number
- Determine if input is a perfect number
- Ordinal numbers
- Lychrel Number Test (Inspired by Project Euler Problem 55)
- Circular Primes (based on Project Euler, problem 35)
- Largest Twin Primes
- Golomb's self-describing sequence (based on Euler 341)
- Is it an Armstrong number?
- Champernowne Constant
- Last non-zero digit
- Generate a Parasitic Number
- Smith numbers
- Evil Number
- Armstrong Number
- Polite numbers. Politeness.
- Polite numbers. N-th polite number.
- Narcissistic number ?
- Is this number Munchhausen?
- P-smooth numbers
- Iccanobif numbers 1
- Amicable numbers
- Extra safe primes
- Pentagonal Numbers
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