Convert a given number to its Roman representation.
For example, if the number is 98, it should display 'XCVIII'
copy of Problem 63.
Sums with Excluded Digits
Make a random, non-repeating vector.
Free passes for everyone!
Count decimal digits of a number
Concatenate two strings
Create the following sequence : 0 1 1 4 9 25 64 169 ...
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