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.
Find the sum of all the numbers of the input vector
Implement a ROT13 cipher
Area of an equilateral triangle
Mersenne Primes vs. All Primes
Scrabble Scores - 10
Radiation Heat Transfer — View Factors (3)
Temperature Conversion Utility
Divisible by n, prime divisors (including powers)
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