161 (number)

Short description: Natural number

| <- 160  | 161 |  162 ->

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← 160 161 162 163 164 165 166 167 168 169 →

List of numbers — Integers

← 0 100 200 300 400 500 600 700 800 900 →

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.

## Contents

* 1 In mathematics
* 2 In the military
* 3 In music
* 4 In transportation
* 5 In other fields
* 6 See also
* 7 External links
* 8 References

## 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
* Engineering:USS Barber (DE-161) was a U.S. Navy Buckley-class destroyer escort during World War II
* Engineering:USS Barite (IX-161) was a U.S. Navy Trefoil-class concrete barge during World War II
* Engineering:USS Beaverhead (AK-161) was a U.S. Navy Alamosa-class cargo ship during World War II
* Engineering:USS Climax (AM-161) was a U.S. Navy Admirable-class minesweeper during World War II
* Engineering:USS Dickens (APA-161) was a U.S. Navy Haskell-class attack transport during World War II
* Engineering:USS Narada (SP-161) was a U.S. Navy wooden yacht during World War I
* Engineering:USS Palmer (DD-161) was a U.S. Navy Wickes-class destroyer during World War II
* Engineering:USS Salinan (ATF-161) was a U.S. Navy Achomawi-class fleet ocean tug following World War II
* Engineering:USS S-50 (SS-161) was a U.S. Navy fourth-group S-class submarine between 1920 and 1931
* Engineering: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

* Number Facts and Trivia: 161
* The Number 161
* VirtueScience: 161

## References

1. ↑ "Sloane's A002412 : Hexagonal pyramidal numbers". OEIS Foundation. https://oeis.org/A002412.
2. ↑ "A002113 - Oeis". https://oeis.org/A002113.
3. ↑ "161>88" (Documentary). Czech Republic: Antifascist Action. 2012. http://film.antifa.cz/?page_id=37.

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