Odd and even numbers in life

/kloc-all odd numbers within 0/00

1,3,5,7,9, 1 1, 13, 15, 17, 19,2 1,23,25,27,29,3 1,33,35,37,39,4 1,43,45,47,49, 5 1,53,55,57, 59,6 1,63,65,67,69,7 1,73,75,77,79,8 1,83,85,87,89,9 1,93,95,97,99。

All even numbers in 100

0,2,4,6,8, 10, 12, 14, 16, 18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86,88,90,92,94,96,98, 100

Extended data

Although the whole prime number is infinite, a random number with 100 digits may be a prime number.

1, there must be at least one prime number between a number greater than 1 and its twice (that is, within the interval (a, 2a)).

2. There is a prime arithmetic progression of any length.

3. An even number can be written as the sum of two composite numbers, and each composite number has at most 9 prime factors. (Norwegian mathematician Brown, 1920)

4. Even numbers must be written as prime numbers plus composite numbers, in which the number of factors of composite numbers has an upper bound. (Renee, 1948)

5. Even numbers must be written as a prime number plus a composite number consisting of at most five factors. Later, someone shortened the result to (1+5).

6. A sufficiently large even number must be written as a prime number plus a composite number consisting of at most two prime factors. Short for (1+2).

Baidu encyclopedia-even number

Baidu encyclopedia-odd number