223 (number)
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| Ordinal | 223rd |
| Cardinal | 223 |
| Factorization | Prime Number |
| Roman numeral | CCXXIII |
| Binary | 11011111 |
| Hexadecimal | DF |
223 is the natural number between 222 and 224. It is also a prime number, and the smallest natural number whose successor lacks its own Wikipedia page.
[edit] In mathematics
223 is a long prime, a strong prime, a lucky prime and a sexy prime (with 229).
223 is the fourth Carol number and the third to be prime.
223 is the sum of three consecutive primes (71 + 73 + 79), the sum of seven consecutive primes (19 + 23 + 29 + 31 + 37 + 41 + 43), and the smallest number requiring 37 fifth powers for Waring representation (see Waring's problem), strictly non-palindromic number.
[edit] In chemistry
223 is the atomic mass of francium.
E223 is the preservative Sodium metabisulphite
[edit] In shooting
223 ("two twenty-three", or "two two three") can refer to a caliber, such as the .223 Remington.
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