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|roman-number = III |
|roman-number = III |
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|ordinal-number = third |
|ordinal-number = third |
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+ | |cardinal-number = three |
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+ | |Base-2 Form = 11 |
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+ | |Base-3 Form = 10 |
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+ | |Base-4 Form = 3 |
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+ | |Base-5 Form = 3 |
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+ | |Base-6 Form = 3 |
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+ | |Base-7 Form = 3 |
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+ | |Base-8 Form = 3 |
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|previous = [[2|<font color="white">2</font>]] |
|previous = [[2|<font color="white">2</font>]] |
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|next = [[5|<font color="white">5</font>]]}} |
|next = [[5|<font color="white">5</font>]]}} |
Revision as of 22:55, 27 December 2013
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.
Proofs
- It is divisible by 1: 3/1=3
- It is not divisible by 2: 3/2=1.5
- It is divisible by 3: 3/3=1
- Therefore it has 2 factors, not 3, because 3 divided by 2 does not result in an integer value.
Relationship with other odd numbers
The numbers before
- 2 is the first prime number. It is the only even prime number.
- 1, the number before 2, is not a prime number.
The numbers after
- The next odd number, 5, is a prime number.
- There are no odd numbers between 3 and 5. As a result, they are twin primes.
- 7, the odd number following 5, is a prime number.
- 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.