Interesting problem but tests are too tricky.
I am not sure that a list of equal numbers qualifies as a series. Would it be a geometric or an arithmetic series?
'Randperm' is making this question a whole lot harder...
How to subtract?
Pi Digit Probability
Number of Even Elements in Fibonacci Sequence
Integer sequence - 2 : Kolakoski sequence
longest common semi-substring
Construct a precedence graph from a code segment
Integer Sequence - II : New Fibonacci
Fermat's last theorem - again
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