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.
Extract leading non-zero digit
Getting logical indexes
Make a run-length companion vector
Change the sign of even index entries of the reversed vector
Integer Sequence - II : New Fibonacci
Make one vector from two others
How brilliant are you?
Golomb's self-describing sequence (based on Euler 341)
That's some divisor you've got there...
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