Prime number (also called prime number) 1. That is to say, among all integers greater than 1, there are no other factors except 1 and itself. This integer is called prime number or prime number (commonly called prime number).

2 3 5 7 1 1 13 17 19 23 29 3 1 37 4 1 43 47

53 59 6 1 67 7 1 73 79 83 89 97 10 1 103 107 109 1 13

127 13 1 137 139 149 15 1 157 163 167 173 179 / kloc-0/8 1 19 1 193 197

199 2 1 1 223 227 229 233 239 24 1 25 1 257 263 269 27 1 277 28 1

283 293 307 3 1 1 3 13 3 17 33 1 337 347 349 353 359 367 373 379

383 389 397 40 1 409 4 19 42 1 43 1 433 439 443 449 457 46 1 463

Natural numbers are used to measure the number of things or to indicate the order of things. That is, the numbers represented by the numbers 0, 1, 2, 3, 4, ...

integer

sequence

…,-2,- 1,0, 1,2,…

The numbers in are called integers. All the integers make up an integer set, which is a ring called Z (usually written as a hollow letter Z in modern times).

The given integer n can be negative (n∈Z-), nonnegative (n∈Z*), zero (n=0) or positive (n ∈ z+).