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.
Remove the vowels
Find the palindrome
Basic arrays operations.
5 Prime Numbers
Divisible by 7
Large Sum (inspired by Project Euler 13)
Radiation Heat Transfer — View Factors (1)
Lights Out 10 - 5x5, with wrapping, 6 moves
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