161 (number)
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Short description: Natural number
| ||||
|---|---|---|---|---|
| Cardinal | one hundred sixty-one | |||
| Ordinal | 161st (one hundred sixty-first) | |||
| Factorization | 7 × 23 | |||
| Divisors | 1, 7, 23, 161 | |||
| Greek numeral | ΡΞΑ´ | |||
| Roman numeral | CLXI | |||
| Binary | 101000012 | |||
| Ternary | 122223 | |||
| Quaternary | 22014 | |||
| Quinary | 11215 | |||
| Senary | 4256 | |||
| Octal | 2418 | |||
| Duodecimal | 11512 | |||
| Hexadecimal | A116 | |||
| Vigesimal | 8120 | |||
| Base 36 | 4H36 | |||
161 (one hundred [and] sixty-one) is the natural number following 160 and preceding 162.
In mathematics
- 161 is the sum of five consecutive prime numbers: 23, 29, 31, 37, and 41
- 161 is a hexagonal pyramidal number.[1]
- 161 is a semiprime. Since its prime factors 7 and 23 are both Gaussian primes, 161 is a Blum integer.
- 161 is a palindromic number[2]
- 161/72 is a commonly used rational approximation of the square root of 5 and is the closest fraction with denominator <300 to that number.
In the military
- USNS Lone Jack (T-AO-161) was a U.S. Navy Type T2 tanker during World War II
- USS Barber (DE-161) was a U.S. Navy Buckley-class destroyer escort during World War II
- USS Barite (IX-161) was a U.S. Navy Trefoil-class concrete barge during World War II
- USS Beaverhead (AK-161) was a U.S. Navy Alamosa-class cargo ship during World War II
- USS Climax (AM-161) was a U.S. Navy Admirable-class minesweeper during World War II
- USS Dickens (APA-161) was a U.S. Navy Haskell-class attack transport during World War II
- USS Narada (SP-161) was a U.S. Navy wooden yacht during World War I
- USS Palmer (DD-161) was a U.S. Navy Wickes-class destroyer during World War II
- USS Salinan (ATF-161) was a U.S. Navy Achomawi-class fleet ocean tug following World War II
- USS S-50 (SS-161) was a U.S. Navy fourth-group S-class submarine between 1920 and 1931
- USS Stingray (SS-161) is a fictional U.S. Navy diesel engine submarine featured in the 1996 film Down Periscope
- The 161st Intelligence Squadron unit of the Kansas Air National Guard. Its parent unit is the 184th Intelligence Wing
In music
- The Bose 161 Speaker System (2001)
- The Kay K-161 ThinTwin guitar
In transportation
- MTA Maryland commuter bus 161
- New Jersey Bus Route 161
- London Bus route 161
In other fields
161 is also:
- The year AD 161 or 161 BC
- 161 AH is a year in the Islamic calendar that corresponds to 777 – 778 CE
- 161 Athor is an M-type Main belt asteroid
- E.161 is an ITU-T assigns letters to the 12-key telephone keypad
- Fiorina Fury 161 is a foundry facility and penal colony from the film Alien 3
- 161 is used by Anti Fascist Action as a code for AFA (A=1, F=6, by order of the alphabet), sometimes used in 161>88[3] (88 is code for Heil Hitler among neo-nazis, as H=8)
See also
- Anti-Fascist Action
- List of highways numbered 161
- United Nations Security Council Resolution 161
- United States Supreme Court cases, Volume 161
External links
References
- ↑ "Sloane's A002412 : Hexagonal pyramidal numbers". OEIS Foundation. https://oeis.org/A002412.
- ↑ "A002113 - Oeis". https://oeis.org/A002113.
- ↑ "161>88" (Documentary). Czech Republic: Antifascist Action. 2012. http://film.antifa.cz/?page_id=37.
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