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.
Finding Perfect Squares
Swap the input arguments
7 segment LED display
Change the sign of even index entries of the reversed vector
Approximation of Pi
Exponents in Factorials
Crunch that matrix!
Circular Primes (based on Project Euler, problem 35)
That's some divisor you've got there...
With apologies to William Blake
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