1, in numbers, 3 represents the second prime number starting from 0, 3 is the third non-zero natural number and the first mersenne prime.
2. In feelings, 3 represents the person who interferes with others' feelings, which is generally called "mistress", which is immoral and often criticized by the world.
3. In Pythagoras' view, "three" is a harmonious number, while Aristotle believes that "three" represents completeness, because "three" has two ends and a middle. Taoism also believes that "three" is a symbol of power, because it means a central element.
4. In homophonic, 3 is the homophonic of "San", which means bad meaning. Gifts usually avoid the number 3.
Application of 3 in mathematics
3 is the second smallest prime number.
Is the only prime number that can be expressed as complete square minus 1.
Is the only prime number that can be expressed as another prime number plus 1.
Is one of only a pair of binary prime numbers.
The second odd number, the last one is 1, and the next one is 5.
The second prime number. The last one is 2, and the next one is 5.
1 One of the twin prime numbers is (3,5) and (2,3).
Fermat prime number 1 (2n+ 1, Fn=2).
The second factorial prime number (2! +1), the last one is 2 and the next one is 5.
The 1 lucky prime number.
The second Sophie germain prime number.
The second dangerous prime number. The last one is 2, and the next one is 13.
In decimal system, both right truncated prime numbers and left truncated prime numbers are available.