241 (number): Difference between revisions
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{{about|the number|the year|241|other uses|241 (disambiguation)}} |
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{{for|uses of the phrase "two for one"|Two for one (disambiguation) {{!}} Two for one}} |
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{{Infobox number |
{{Infobox number |
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| number = 241 |
| number = 241 |
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| prime = twin prime |
| prime = twin prime |
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'''241''' is the natural number between [[240 (number)|240]] and [[242 (number)|242]]. It is also a [[prime number]]. |
'''241''' ('''two hundred [and] forty-one''') is the natural number between [[240 (number)|240]] and [[242 (number)|242]]. It is also a [[prime number]]. |
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==In mathematics== |
== In mathematics == |
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241 is the larger of the [[twin prime]]s (239, 241). Twin primes are pairs of primes separated by 2. |
* 241 is the larger of the [[twin prime]]s (239, 241). Twin primes are pairs of primes separated by 2. |
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* 241 is a [[regular prime]]<ref>{{Cite web|url=https://oeis.org/A007703|title=Sloane's A007703 : Regular primes|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}</ref> and a [[lucky prime]].<ref>{{Cite web|url=https://oeis.org/A031157|title=Sloane's A031157 : Numbers that are both lucky and prime|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}</ref> Since 241 = 15 × 2<sup>4</sup> + 1, it is a [[Proth prime]]. |
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== In other fields == |
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241 is a [[regular prime]] and a [[lucky prime]]. |
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* [[Americium-241]] is an [[isotope]] commonly used in [[smoke detector]]s.<ref>{{Cite web |last=US EPA |first=OAR |date=2018-11-27 |title=Americium in Ionization Smoke Detectors |url=https://www.epa.gov/radtown/americium-ionization-smoke-detectors |access-date=2024-08-17 |website=www.epa.gov |language=en-US}}</ref> |
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Since 241 = 15 × 2<sup>4</sup> + 1, it is a [[Proth prime]]. |
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==In Chemistry== |
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[[Americium-241]] is the most common isotope of Americium, used in smoke detectors |
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==In popular culture== |
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* [[Reel Big Fish]] wrote a song entitled "241," where the number is repeated as the only lyric. |
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* A short form of the phrase "Two for One" describing a discount. |
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== References == |
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{{Reflist}} |
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{{Integers|2}} |
{{Integers|2}} |
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Latest revision as of 14:37, 17 August 2024
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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, 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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