Produce the following matrix
x = [2 3 4]
[1 1/2 1/3;
2 1 1/4;
3 4 1];
Swap the first and last columns
Return a list sorted by number of occurrences
Remove the polynomials that have positive real elements of their roots.
Divisible by 2
create a square matrix
Decrypt a secret message!
Your favourite city!
String permutations on phone keyboard
Digit concentration in Champernowne's constant
Write c^3 as sum of two squares a^2+b^2
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