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 unique values without sorting
Set a diagonal
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Write c^3 as sum of two squares a^2+b^2
How Far Can You Throw Something?
That's some divisor you've got there...
Diophantine Equations (Inspired by Project Euler, problem 66)
S-T-R-E-T-C-H I-T O-U-T
Golomb's self-describing sequence (based on Euler 341)
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