241 (number)

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

← 240 241 242 →
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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
Octal	3618
Duodecimal	18112
Hexadecimal	F116

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 × 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 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

1. "Sloane's A007703 : Regular primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
2. "Sloane's A031157 : Numbers that are both lucky and prime". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.