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.
Encode Roman Numerals
Find the 9's Complement
Divisible by 4
Van Eck's Sequence's nth member
Still more miles to go before I sleep
I've got the power! (Inspired by Project Euler problem 29)
Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock. Tick. Tock.
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