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.
Replace NaNs with the number that appears to its left in the row.
Find nearest prime number less than input number
Matrix to column conversion
Rounding off numbers to n decimals
Lights Out 13 - 5x5, three stages, x moves
Combined Ages 3 - Non-symmetric, n ≥ 3
Divisible by n, prime divisors (including powers)
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