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.
Return the 3n+1 sequence for n
Is this matrix orthogonal?
Side of a rhombus
Divisible by 3
Pseudo Square Root (Inspired by Project Euler 266)
Rolling maximums above a threshold
I'm going to enjoy watching you calculate, Mr Anderson
Now 20% off!
The cake is a lie...
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