| 释义 |
- In mathematics
- In geography
- In music
- In other fields
- See also
- References
- External links
{{example farm|date=March 2010}}{{Infobox number
| number = 197
| prime = 45th
}}197 (one hundred [and] ninety-seven) is the natural number following 196 and preceding 198. In mathematics- 197 is an odd number
- 197 is a prime number
- 197 is a Chen prime
- 197 is an Eisenstein prime with no imaginary part
- 197 is a strong prime
- 197 is a twin prime with 199
- 197 is the third of a prime quadruplet: 191, 193, 197, 199
- 197 is the smallest prime number that is the sum of 7 consecutive primes: 17 + 19 + 23 + 29 + 31 + 37 + 41
- 197 is the sum of the first twelve prime numbers: 2 + 3 + 5 + 7 + 11 + 13 + 17 + 19 + 23 + 29 + 31 + 37
- 197 is a centered heptagonal number, a centered figurate number that represents a heptagon with a dot in the center and all other dots surrounding the center dot in successive heptagonal layers
- 197 is a deficient number, as 1 is less than 197
- 197 is a Keith or repfigit number[1]
- 197 is a palindromic prime in base 14 (101).
- 197 is a square-free number
- 197 is a super Catalan number[2]
- 197 is an Ulam number
- 197 is the sum of the digits of all two-digit prime numbers: 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97
In geography- 197 Yonge Street, site of the former Canadian Bank of Commerce building
- House at 197 Hornbine Road, Rehoboth, Massachusetts
- House at 197 Morrison Avenue, Somerville, Massachusetts
In music- "197" is a song by Norwegian alternative rock group Major Parkinson from their self-titled debut album
In other fields 197 is also: - A police emergency telephone number in Tunisia
- The year AD 197 or 197 BC
- The atomic number of an element temporarily called Unennseptium
- 197 Arete is a Main belt asteroid. It has a very bright surface, unusually bright even for a rocky S-type asteroid
- Minuscule 197 is a Greek minuscule manuscript of the New Testament, on parchment
See also- List of highways numbered 197
- United Nations Security Council Resolution 197
- United States Supreme Court cases, Volume 197
- Pennsylvania House of Representatives, District 197
- Polo Independent Order of Odd Fellows Lodge No. 197
- P.S. 197, Brooklyn, New York
References1. ^{{Cite web|url=https://oeis.org/A007629|title=Sloane's A007629 : Repfigit numbers|last=|first=|date=|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}
2. ^{{Cite web|url=https://oeis.org/A001003|title=Sloane's A001003 : Schroeder's second problem (generalized parentheses); also called super-Catalan numbers or little Schroeder numbers|last=|first=|date=|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-28}}
External links{{Commons category|197 (number)}}- [https://web.archive.org/web/20061002152212/http://athensohio.net/reference/number/197/ Number Facts and Trivia: 197]
- The Number 197
- Number Gossip: 197
- The Positive Integer 197
- Virtual Science: 197
- Prime Curiosities: 197
{{Integers|1}}{{DEFAULTSORT:197 (Number)}} 1 : Integers |