241 (number)

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

This article is about the number. For the year, see 241. For other uses, see 241 (disambiguation).
For uses of the phrase "two for one", see Two for one.
← 240 241 242 →
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Cardinaltwo hundred forty-one
Ordinal241st
(two hundred forty-first)
Factorizationprime
Primetwin prime
Greek numeralΣΜΑ´
Roman numeralCCXLI
Binary111100012
Ternary222213
Octal3618
Duodecimal18112
HexadecimalF116

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.

  • 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

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.
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