It'd be good to indicate which kolakoski sequence you mean since I can find at least two different ones
1. wikipedia = http://oeis.org/A000002
2. wolfram mathworld = http://oeis.org/A006928
it is https://oeis.org/A000002
Which values occur exactly three times?
So many choices
Project Euler: Problem 9, Pythagorean numbers
Fill a zeros matrix
01 - Scalar variables
Elements with highest local average
longest common substring : Skipped character version
Diagonal of a Spiral Matrix
Neither minima nor maxima
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