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.
Duplicate each element of a vector.
Is this triangle right-angled?
Solving Quadratic Equations (Version 1)
NaN (欠損値) が含まれている行を削除しよう
Remove white spaces at the end of the input string
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