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.
Find the peak 3n+1 sequence value
Factorize THIS, buddy
Project Euler: Problem 8, Find largest product in a large string of numbers
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Find the next prime number
Hackathon - String version
Longest run of consecutive numbers
Matrix of Multiplication Facts
The cake is a lie...
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