Write a function that combines two lists by alternating the elements, e.g. ['a','b','c'], ['1','2','3'] → 'a1b2c3'.
Remove all the consonants
Encode Roman Numerals
Sorted highest to lowest?
"Look and say" sequence
Ratio between sum of primer numbers and non-prime numbers
Approximate the inverse tangent by power series
Sum of a geometric series
Alternating 1´s and 0´s in a matrix
Ratio between sum of primes and sum of factors
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