241 (number)
 | This article needs additional citations for verification. (May 2016) |
| ||||
|---|---|---|---|---|
| Cardinal | two hundred forty-one | |||
| Ordinal | 241st (two hundred forty-first) | |||
| Factorization | prime | |||
| Prime | twin prime | |||
| Greek numeral | ΣΜΑ´ | |||
| Roman numeral | CCXLI | |||
| Binary | 111100012 | |||
| Ternary | 222213 | |||
| Senary | 10416 | |||
| Octal | 3618 | |||
| Duodecimal | 18112 | |||
| Hexadecimal | F116 | |||
241 (two hundred [and] forty-one) is the natural number between 240 and 242. It is also a prime number.
In mathematics
[edit]- 241 is the larger of the twin primes (239, 241). Twin primes are pairs of primes separated by 2.
- 241 is a regular prime[1] and a lucky prime.[2] Since 241 = 15 × 24 + 1, it is a Proth prime.
- 241 is a repdigit in base 15 (111).
- 241 is the only known Lucas–Wieferich prime to (U, V) = (3, −1).
In other fields
[edit]- Americium-241 is an isotope commonly used in smoke detectors.[3]
References
[edit]- ^ "Sloane's A007703 : Regular primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ^ "Sloane's A031157 : Numbers that are both lucky and prime". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
- ^ US EPA, OAR (2018-11-27). "Americium in Ionization Smoke Detectors". www.epa.gov. Retrieved 2024-08-17.
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