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.
Implement a ROT13 cipher
Back to basics 20 - singleton dimensions
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
With apologies to William Blake
Pseudo Square Root (Inspired by Project Euler 266)
Still more miles to go before I sleep
Rolling maximums above a threshold
Should Mr McNugget even get out of bed today?
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