It's very sad that there is no matlab function "npermsk".
Not work for R is long, and k is small.
For example, R = 1:100, k = 2.
@li haitao, the max digital is 9. If length of R great than 10, it is another problem. I think you can submit a problem like this but larger R.
@ Binbin Qi, You're right.
Remove all the consonants
Find the numeric mean of the prime numbers in a matrix.
Project Euler: Problem 10, Sum of Primes
Television Screen Dimensions
Points on a Sphere
Points on a circle.
Give me Hamming on five, hold the mayo
Exponents in Factorials
Go to the head of the class!
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