3 is the second prime number, and the second single digit prime number. 3's prime factors are 1 and 3. It is said to be the first odd prime, because the previous prime number is [[2]], which is even.

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==Proofs==

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*It is [[Divisibility Rules|divisible by]] 1: 3/1=3

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*It is '''not '''divisible by {{2}}: 3/2=1.5

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*It is divisible by {{3}}: 3/3=1

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*Therefore it has 2 factors, not 3, because 3 divided by 2 does not result in an [[integer]] value.

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==Relationship with other odd numbers==

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===The numbers before===

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*2 is the first prime number. It is the only '''even''' prime number.

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*'''1''', the number before 2, is '''not '''a prime number.

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===The numbers after===

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*The next odd number, [[5]], is a prime number.

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**There are no odd numbers between 3 and 5. As a result, they are twin primes.

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*[[7]], the odd number following 5, is a prime number.

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**3 and 7 are four numbers apart, therefore, they are cousin primes.

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*9, the odd number following 7, is not a prime number. It is a square number, and the first odd composite number.

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==Usage==

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===General===

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* Trilogy refers to a set of three works of art that are connected, either as a single work or three individual works.

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===Science===

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*Lithium's atomic number and number of electrons are 3.

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*Group three elements also have the valence of +3. Similarly, group five elements have the valence of -3.

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*Tritium / hydrogen-3, has a nucleon number of 3.

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===Sports===

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*In basketball, a shot behind the three-point arc is worth three points, unless in the 3x3 variant.

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* In baseball, 3 strikes are required for the player to be considered "out", and 3 outs are required for the attacking team to exchange with the opposing team.

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===Video Games===

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*In The Legend of Zelda series, there is a sacred relic called Triforce, which consists of three separate golden triangles.

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[[tl:3]]

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{{Navbox primes}}

[[Category:Prime numbers from 1-100| 3]]

[[Category:Prime numbers from 1-100| 3]]

[[Category:Prime Numbers]]

[[Category:Prime Numbers]]

Revision as of 13:13, February 15, 2014

3 is the second prime number, and the second single digit prime number. 3's prime factors are 1 and 3. It is said to be the first odd prime, because the previous prime number is 2, which is even.

3 and 7 are four numbers apart, therefore, they are cousin primes.

9, the odd number following 7, is not a prime number. It is a square number, and the first odd composite number.

Usage

General

Trilogy refers to a set of three works of art that are connected, either as a single work or three individual works.

Science

Lithium's atomic number and number of electrons are 3.

Group three elements also have the valence of +3. Similarly, group five elements have the valence of -3.

Tritium / hydrogen-3, has a nucleon number of 3.

Sports

In basketball, a shot behind the three-point arc is worth three points, unless in the 3x3 variant.

In baseball, 3 strikes are required for the player to be considered "out", and 3 outs are required for the attacking team to exchange with the opposing team.

Video Games

In The Legend of Zelda series, there is a sacred relic called Triforce, which consists of three separate golden triangles.