Is there any particular reason why "1" should be a prime number? Since none of exampe in test suite pointing us to that direction. besides, I fail to figure out the necessity of that either.
Mathematically speaking, 1 is not a prime number. Primes are defined as number greater than 1. Also, the difference between 2 and 1 isn't two, so I don't see why [1 2] would be a valid output anyway.
James and bainhome, I apologise for making the two errors that you pointed out. I have corrected them and updated the problem.
Tell me the slope
What is Sum Of all elements of Matrix
Sum of series I
Sum of series III
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