# 241 (number)

From HandWiki

__: Natural number__

**Short description**
| ||||
---|---|---|---|---|

Cardinal | two hundred forty-one | |||

Ordinal | 241st (two hundred forty-first) | |||

Factorization | prime | |||

Prime | twin prime | |||

Greek numeral | ΣΜΑ´ | |||

Roman numeral | CCXLI | |||

Binary | 11110001_{2} | |||

Ternary | 22221_{3} | |||

Quaternary | 3301_{4} | |||

Quinary | 1431_{5} | |||

Senary | 1041_{6} | |||

Octal | 361_{8} | |||

Duodecimal | 181_{12} | |||

Hexadecimal | F1_{16} | |||

Vigesimal | C1_{20} | |||

Base 36 | 6P_{36} |

**241** (**two hundred [and] forty-one**) is the natural number between 240 and 242. It is also a prime number.

## In mathematics

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 × 2^{4} + 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 Chemistry

Americium-241 is the most common isotope of Americium, used in smoke detectors.

## In popular culture

- Reel Big Fish wrote a song entitled "241," where the number is repeated as the only lyric.
- Another song entitled "241" is sung by Filipino band Rivermaya.

## See also

- List of highways numbered 241

## References

- ↑ "Sloane's A007703 : Regular primes". OEIS Foundation. https://oeis.org/A007703.
- ↑ "Sloane's A031157 : Numbers that are both lucky and prime". OEIS Foundation. https://oeis.org/A031157.

Original source: https://en.wikipedia.org/wiki/241 (number).
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