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Encyclopedia > 19th
(Redirected from 19th)

19 (nineteen) is the natural number following 18 and preceding 20.



<< 10 11 12 13 14 15 16 17 18 19 >>

Cardinal nineteen
Ordinal nineteenth
Factorization prime
Divisors 1, 19
Roman numeral XIX
Binary 10011
Hexadecimal 13


Contents

In mathematics

Nineteen is the 8th smallest prime number. The sequence continues 23, 29, 31, 37... 19 is the seventh Mersenne prime exponent.


It is also a Keith number, because it recurs in a Fibonacci-like sequence started from its base 10 digits: 1, 9, 10, 19...


With respect to divisibility, nineteen has a very simple test: 19 divides 100*a+b if and only if it divides a+4*b.


Nineteen is a centered triangular number, centered hexagonal number, and an octahedral number.


Every positive integer is the sum of at most nineteen fourth powers (see Waring's problem).


The decimal expansion of 1/19 has a period of maximum length: 18 digits.


Nineteen is a Heegner number.


In science

In astronomy,

Messier object M19, a magnitude 8.5 globular cluster in the constellation Ophiuchus
The New General Catalogue object (http://www.ngcic.org/) NGC 19, a barred spiral galaxy in the constellation Andromeda
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/SEsaros/SEsaros1-175.html) of the solar eclipse series which began on -2333 June 15 and ended on -1035 August 1. The duration of Saros series 19 was 1298.1 years, and it contained 73 solar eclipses.
The Saros number (http://sunearth.gsfc.nasa.gov/eclipse/LEsaros/LEsaros1-175.html) of the lunar eclipse series which began on -2031 March 24 and ended on -733 May 11. The duration of Saros series 19 was 1298.1 years, and it contained 73 lunar eclipses.

In music

"19" is a 1985 hit song by Paul Hardcastle, with a strong anti-war message, based on 19 being the average age of soldiers in the Vietnam war.


Other songs with the number in their titles include "Nineteen" by the Old 97's and "Hey, Nineteen" by Steely Dan.


In other fields

Nineteen is

External link

  • "19" lyrics (http://www.80smusiclyrics.com/artists/paulhardcastle.htm)
  • Prime Curios for the number 19 (http://primes.utm.edu/curios/page.php/19.html)





  Results from FactBites:
 
Kamat Research Database - 19th Century India (325 words)
The study of 19th century India (years 1801- 1900) provides a glimpse of India in its earlier centuries, while many records of the period are available due to the western influences.
The most important events that occurred are the establishment of British in India, the First Indian War of Independence, the end of Mughal empire, and early signs of Indian renaissance that led to India's freedom and drastic social reforms.
Some of the important Indians who lived in 19th century are: Dayanand Saraswati, Bahadur Shah II, Raja Ravi Varma, and Raja Ram Mohan Roy.
Utopia, Dystopia, and Myopia (2917 words)
In the context of the second half of the 19th century, the feeling of being cheated and swept aside by progress that was experienced to a painful degree by the more sensitive minds, caused those people to become defensive, aggressive and dismissive against the modern time.
Cataclysmic writers of the late 19th century such as Ignatius Donnelly shared the feeling of being cheated and swept aside by progress, and they were therefore on the defensive against modern times.
Kenneth Roemer states that, "...many late 19th century Americans suffered from 'future shock'...," in the sense that they were thoroughly confused, even frightened, by the swift and profound changes of their time (Roemer 5).
  More results at FactBites »


 

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