Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
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Remove the air bubbles
Back to basics 11 - Max Integer
find radius of cone
Find the index of n in magic(n)
Lights Out 13 - 5x5, three stages, x moves
Evened up (or not)
Lights Out 6 - 5x5, 13 moves
Inscribed Pentagon? 2
Scrabble Scores - 6
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