What is an odd prime?

I heard the term “odd prime” often. Isn’t it redundant? If n is even then 2 divides n so it’s not prime. Why is “odd” emphasized?

Answer

2 is an even prime, so “odd prime” is a short-hand for “a prime not equal to 2“.

Attribution
Source : Link , Question Author : user221304 , Answer Author : Spenser

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