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.
Project Euler: Problem 9, Pythagorean numbers
Stuff the Board
Number of 1s in a binary string
MATLAB Basic: rounding II
Find the next Fibonacci number
Miles to go before I sleep
Sums of Distinct Powers
That's some divisor you've got there...
Two fractions, one sum
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