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.
Longest run of consecutive numbers
Sum the Digits of a Number
Length of a short side
Vector parallel to plane?
Lights Out 8 - 5x5, light-only solution? I
5 Prime Numbers
Fraction of a fraction of a ...
5th Time's a Charm
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