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|Cardinal||two hundred forty-one|
(two hundred forty-first)
241 is the larger of the twin primes (239, 241). Twin primes are pairs of primes separated by 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).
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.
- A short form of the phrase "Two for One" describing a discount.
- "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.
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