197 (number)

197 (number)

197 is the natural number between 196 and 198. It is also a prime number.

In mathematics

197 is a prime number and a twin prime with 199. The third of a prime quadruplet, 197 sets a record low for the Mertens function, -7. It is also a Chen prime, and an Eisenstein prime with no imaginary part.

There are two different ways of expressing 197 as a sum of consecutive primes: as the sum of the first twelve primes and also the sum of seven consecutive primes (17 + 19 + 23 + 29 + 31 + 37 + 41).

197 is a centered heptagonal number.


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • 197 Yonge Street — was formerly a four floor Canadian Bank of Commerce building built in 1905 by architects Pearson and Darling and declared as a historical property by the City of Toronto in 1974. Next door at 205 Yonge Street is another historic site. The gap… …   Wikipedia

  • 197 — NOTOC EventsBy PlaceRoman Empire* 19 February Battle of Lugdunum: Roman usurper Albinus is defeated by the forces of Roman Emperor Septimius Severus. * Lyon, which had been the headquarters of Clodius Albinus, is sacked and destroyed. * Sixty… …   Wikipedia

  • 197 BC — NOTOC EventsBy placeGreece* The Spartan ruler, Nabis, acquires the important city of Argos from Philip V of Macedon, as the price of his alliance with the Macedonians. Nabis then defects to the Romans in the expectation of being able to hold on… …   Wikipedia

  • Wikipedia:List of Wikipedians by number of edits — Shortcuts: WP:NOE WP:WBE WP:EDITS WP:MOSTEDITS This is a list of Wikipedians ordered by number of edits in the English language Wikipedia. Edits in all namespaces are counted; deleted edits have been included in recent versions. Click… …   Wikipedia

  • 900 (number) — For the year 900, see 900 BC or 900 AD. 900 (nine hundred) is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler s totient function for the first 54 integers. In base 10 it is a Harshad number. List of …   Wikipedia

  • OR&N 197 — Oregon Railroad Navigation 197 Power type Steam Builder Baldwin Locomotive Works Serial number 25717 Build date May 1905 Configuration 4 6 2 UIC classification 2′C1′ Gauge …   Wikipedia

  • 500 (number) — For other uses, see 500 (disambiguation). ← 499 501 → 500 List of numbers Integers …   Wikipedia

  • Arado Ar 197 — infobox Aircraft name =Ar 197 type = Naval fighter manufacturer =Arado Flugzeugwerke caption = designer = first flight =Spring 1937 introduced = retired = status = Prototype primary user =Luftwaffe produced = number built = 3 unit cost =… …   Wikipedia

  • Bundesstraße 197 — Vorlage:Infobox hochrangige Straße/Wartung/DE B Bundesstraße 197 in Deutschland Ka …   Deutsch Wikipedia

  • Keith number — In mathematics, a Keith number or repfigit number (short for repetitive Fibonacci like digit) is an integer N > 9 that appears as a term in a linear recurrence relation with initial terms based on its own digits. Given an n digit number : N=sum… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”