What is an odd prime?

March 3, 2022 by admin

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

Post navigation

Torsionless not separable abelian groups
The action of the unitary divisors group on the set of divisors and odd perfect numbers
Minimal generation for finite abelian groups
Short exact sequence 0→Z→A→R→00\to \mathbb Z\to A \to \mathbb R \to 0
Cardinality of the set of elements of fixed order.