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.
Sort a list of complex numbers based on far they are from the origin.
Permute diagonal and antidiagonal
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
Create an n-by-n null matrix and fill with ones certain positions
How brilliant are you?
Sums of Multiple Pairs of Triangular Numbers
Numbered lottery balls into cells
Reindex a vector
It's Happy! It's Fun! It's Happy Fun Hyperball!
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