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− | {{Infobox |
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− | |title = 3 |
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− | |image = 3.png |
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− | |imagewidth = 200 |
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− | |roman-number = III |
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− | |ordinal-number = third |
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− | |previous = [[2|<font color="white">2</font>]] |
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− | |next = [[5|<font color="white">5</font>]]}} |
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− | 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 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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− | ===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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− | ===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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− | {{Navbox primes}} |
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[[Category:Prime numbers from 1-100]] |
[[Category:Prime numbers from 1-100]] |
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[[Category:Prime Numbers]] |
[[Category:Prime Numbers]] |

## Revision as of 11:16, December 16, 2013

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