Obviously @cpu wanted to write that the key's bit size must be divisible by 8. An RSA modulus can never be divisible by 8 (and not even by 2 if you actually want some security). 
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Obviously @cpu wanted to write that the key's bit size must be divisible by 8. An RSA modulus can never be divisible by 8 (and not even by 2 if you actually want some security).