| Decimal | 13 |
| Binary | 1101 |
| Hexadecimal | 0xd |
| Roman | XIII |
| Square root of | 169 |
| The number 13 | is prime! |
| English | thirteen |
| Wikipedia article about 13 | Article about 13 |
| ASCII code for | Carriage Return |
| random from 0 to 6 | Show |
| random from 0 to 10 | Show |
| random from 0 to 100 | Show |
| random from 0 to 1000 | Show |