193 (number)

193 (one hundred [and] ninety-three) is the natural number following 192 and preceding 194.

In mathematics

193 is an odd number
193 is a centered 32-gonal number
193 is a happy number
193 is a lucky number
193 is an odious number
193 is a square-free number
193 is the sum of 2 square numbers: 12² + 7² (or 144 + 49)
193 is the difference of 2 square numbers: 97² - 96² (or 9409 - 9216)
193 is a prime number
- 193 is a Cuban prime
- 193 is a full reptend prime
- 193 is a Pierpont prime^[1]
- 193 is a Pillai prime^[2]
- 193 is a Proth prime, as it is 3 × 2⁶ + 1
- 193 is a twin prime with 191
- 193 is the only odd prime p known for which 2 is not a primitive root of $4p^{2}+1$ .^[3]
193 can be written as the difference between the product and the sum of the first four primes
193 is a twin number
193/71 is the most accurate approximation of Euler's Number (e) such that both the numerator and the denominator are integers less than 200 (approx. 99.99897% accurate)

Eyebrow No. 193 is a rural municipality in Saskatchewan, Canada
House at 193 Vernon Street, a historic house at 193 Vernon Street in Wakefield, Massachusetts

193 Squadron Israeli Air Force AS565 Panther helicopter squadron
193rd Special Operations Wing assigned to the Pennsylvania Air National Guard, the parent unit of the 193rd Special Operations Squadron
193rd Battalion unit in the Canadian Expeditionary Force during World War I
193rd Infantry Brigade United States Army Reserve during World War II
Bristol Type 193 Belvedere was a Royal Air Force twin-engined, tandem rotor military helicopter during the 1960
No. 193 Squadron was a Royal Air Force squadron during World War II
USA 193 is an American military spy satellite launched on December 14, 2006
USNS Glomar Explorer (T-AG-193) United States Navy vessel used for deep-sea drilling
USNS Walter S. Diehl (T-AO-193) is a United States Navy Henry J. Kaiser-class oiler
USS Abel P. Upshur (DD-193) was a United States Navy Clemson-class destroyer until World War II
USS Garfield Thomas (DE-193) was a United States Navy Cannon-class destroyer escort during World War II
USS Jacana (AMS-193) was a United States Navy Falcon-class motor minesweeper from 1954–1976
USS Lancaster (AK-193) was a United States Navy Alamosa-class cargo ship during World War II
USS Sanborn (APA-193) was a United States Navy Haskell-class attack transport during World War II
USS Swordfish (SS-193) was a United States Navy Sargo-class submarine during World War II

National Airlines Flight 193 crashed into Escambia Bay by Pensacola International Airport on May 8, 1978

193 is also:

The year AD 193 or 193 BC
The atomic number of an element temporarily called Unenntrium
193 Ambrosia is a main belt asteroid
Minuscule 193 is a Greek minuscule manuscript of the New Testament, on parchment
ICRF 193 is a topoisomerase inhibitor
Trial of the 193 was a series of criminal trials in Russia in 1877–1878

^ "Sloane's A005109 : Class 1- (or Pierpont) primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
^ "Sloane's A063980 : Pillai primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
^ E. Friedman, "What's Special About This Number Archived 2018-02-23 at the Wayback Machine" Accessed 2 January 2006 and again 15 August 2007.