Misplaced Pages

49 (number): Difference between revisions

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Browse history interactively← Previous editContent deleted Content addedVisualWikitext
Revision as of 07:46, 29 July 2023 edit196.189.80.33 (talk)No edit summaryTags: Reverted Mobile edit Mobile web edit← Previous edit Latest revision as of 01:56, 7 January 2025 edit undoLethargilistic (talk | contribs)Extended confirmed users8,455 editsNo edit summary 
(33 intermediate revisions by 27 users not shown)
Line 1: Line 1:
{{Refimprove|date=May 2016}} {{Refimprove|date=May 2016}}
{{Infobox number {{Infobox number
| number = 50 | number = 49
| divisor = 1, 7, 50 | divisor = 1, 7, 49
}} }}
'''50''' ('''forty-nine''') is the ] following ] and preceding ]. '''49''' ('''forty-nine''') is the ] following ] and preceding ].


==In mathematics== ==In mathematics==
'''Forty-nine''' is the square of ]. '''Forty-nine''' is the square of the prime number ] and hence the fourth non-unitary square ] of the form ''p''<sup>2</sup>.


It appears in the ], preceded by the terms 21, 28, 37 (it is the sum of the first two of these).<ref>{{Cite web|url=https://oeis.org/A000931|title=Sloane's A000931 : Padovan sequence|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-30}}</ref> It appears in the ], preceded by the terms 21, 28, 37 (it is the sum of the first two of these).<ref>{{Cite web|url=https://oeis.org/A000931|title=Sloane's A000931 : Padovan sequence|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-30}}</ref>


Along with the number that immediately derives from it, 77, the only number under ] not having its ] known ({{As of|2016|lc=y}}). Along with the number that immediately derives from it, 77, the only number under ] not having its ] known ({{As of|2016|lc=y}}).

The smallest triple of three squares in arithmetic succession is (1,25,49), and the second smallest is (49,169,289).

49 is the smallest ] of a ].<ref>{{Cite OEIS |A006832 |Discriminants of totally real cubic fields. |access-date=2024-03-20 }}</ref>

49 and 94 are the only numbers below 100 whose all permutations are composites but they are not multiples of 3, repdigits or numbers which only have digits 0, 2, 4, 5, 6 and 8, even excluding the trivial one digit terms.

49 = 7^2 and 94 = 2 * 47

The number of ] with 9 crossings is 49.<ref>{{cite OEIS|A002863|Number of prime knots with n crossings}}</ref>


=== Decimal representation === === Decimal representation ===


The sum of the digits of the square of 50 (2401) is the square root of 50. The sum of the digits of the square of 49 (2401) is the square root of 49.


50 is the first square where the digits are squares. In this case, 4 and 9 are squares. 49 is the first square where the digits are squares. In this case, 4 and 9 are squares.


==== Reciprocal ==== ==== Reciprocal ====
{{See also| Repeating decimal}} {{See also| Repeating decimal}}


The fraction {{sfrac|1|50}} is a repeating decimal with a period of 42: The fraction {{sfrac|1|49}} is a repeating decimal with a period of 42:


:{{sfrac|1|50}} = {{overline|0.|0204081632 6530612244 8979591836 7346938775 51}} (42 digits repeat) :{{sfrac|1|49}} = {{overline|0.|0204081632 6530612244 8979591836 7346938775 51}} (42 digits repeat)


There are 42 (note that this number is the period) positive integers that are less than 50 and coprime to 50. Multiplying 020408163265306122448979591836734693877551 by each of these integers results in a ] of the original number: There are 42 positive integers less than 49 and coprime to 49. (42 is the period.) Multiplying 020408163265306122448979591836734693877551 by each of these integers results in a ] of the original number:


*020408163265306122448979591836734693877551 &times; 2 = 040816326530612244897959183673469387755102 *020408163265306122448979591836734693877551 &times; 2 = 040816326530612244897959183673469387755102
Line 55: Line 65:


==In chemistry== ==In chemistry==
⚫ * During the ], ] was also often referred to simply as "49". Number 4 was for the last digit in 94 (atomic number of plutonium) and 9 for the last digit in Pu-239, the weapon-grade fissile isotope used in nuclear bombs.<ref>
* The ] of ].
⚫ {{Cite journal|last=Hammel|first=E.F.|year=2000|title=The taming of "49" — Big Science in little time. Recollections of Edward F. Hammel, pp. 2-9. In: Cooper N.G. Ed. (2000). Challenges in Plutonium Science
⚫ * During the ], ] was also often referred to simply as "50". Number 4 was for the last digit in 94 (atomic number of plutonium) and 9 for the last digit in Pu-239, the weapon-grade fissile isotope used in nuclear bombs.<ref>
⚫ {{Cite journal|last=Hammel|first=E.F.|year=2000|title=The taming of "50" — Big Science in little time. Recollections of Edward F. Hammel, pp. 2-9. In: Cooper N.G. Ed. (2000). Challenges in Plutonium Science
| journal = ]|volume=26|issue=1|pages=2–9|url=http://www.fas.org/sgp/othergov/doe/lanl/pubs/00818010.pdf}}</ref><ref> | journal = ]|volume=26|issue=1|pages=2–9|url=http://www.fas.org/sgp/othergov/doe/lanl/pubs/00818010.pdf}}</ref><ref>
{{Cite journal|last=Hecker|first=S.S.|year=2000|title=Plutonium: an historical overview. In: Challenges in Plutonium Science {{Cite journal|last=Hecker|first=S.S.|year=2000|title=Plutonium: an historical overview. In: Challenges in Plutonium Science
| journal = Los Alamos Science|volume=26|issue=1|pages=1–2|url=http://www.fas.org/sgp/othergov/doe/lanl/pubs/number26.htm}}</ref> | journal = Los Alamos Science|volume=26|issue=1|pages=1–2|url=http://www.fas.org/sgp/othergov/doe/lanl/pubs/number26.htm}}</ref>

==In astronomy==
* ] ], a ] 10.0 ] in the ] ].
* The ] object ], a ] in the constellation ].


==In religion== ==In religion==
* In ]: the number of days of the ] and the number of years in a ] cycle. * In ]: the number of days of the ] and the number of years in a ] cycle.
⚫ * In ], 49 days is one of the lengths of the intermediate state (])
* The number of days and night ] spent meditating as a holy man
⚫ * In ], 50 days is one of the lengths of the ] (])

==In sports==
{{See also|50er (disambiguation)#Sports{{!}}50er § Sports}}
* ''49er'', a member of the ] team of the ] (]).
* ] had a ] between May 2003 and October 2004 until they lost to ], which is a national record in ].
* ] ended his ] career as the only heavyweight champion with a perfect record—50 wins in 50 professional bouts, with 43 knockouts.{{cn|date=May 2018}}
* ] ] team ] holds the lowest ever team total in IPL history in the 2017 edition of IPL

==In music==
{{see also|50er (disam", a 19th century folk song about the ], recorded by Bob Dylan (on the album '']'') and by many others<ref>{{cite web| publisher=]| title=Days of Forty-Nine, The| url=https://www.fresnostate.edu/folklore/ballads/R198.html| accessdate=2022-10-09}}</ref><ref>{{cite web|
publisher=]| title=RN2803: Days of '50| url=https://www.vwml.org/roudnumber/2803| accessdate=2022-10-09}}</ref>
* '']'' is a one-track solo album by ].
* In ] lore, it was at the junction of US Highway 49 and 61 in ], that legendary bluesman ] sold his soul to the devil in return for fame and success. In later years ] immortalized the road in the song "Highway 49", originally written by ].{{cn|date=May 2018}}


==In other fields== ==In other fields==
{{Seealso|List of highways numbered 49}}
'''Forty-nine''' is: '''Forty-nine''' is:
* '']'', one who participated in the 1849 ]. This meaning has endured and things continue to be referred to as "49er," such as a member of the ] team of the ].
* ] is a ] ]
* ''49er'', one who participated in the 1849 ].
* The ] phone calls to ]
* In the title of ]'s novel '']''
* In the title of the movies '']'' and '']''
* A 49 is a party after a ] or any gathering of American Indians, held by the participants. It is also type of song that is sung on such occasions. A 49 is typically held in an isolated place and features drumming and singing.<ref>{{cite web|url=https://www.britannica.com/art/forty-nine-dance|title=Forty-nine dance|website=]|access-date=May 25, 2018}}</ref> * A 49 is a party after a ] or any gathering of American Indians, held by the participants. It is also type of song that is sung on such occasions. A 49 is typically held in an isolated place and features drumming and singing.<ref>{{cite web|url=https://www.britannica.com/art/forty-nine-dance|title=Forty-nine dance|website=]|access-date=May 25, 2018}}</ref>
* ] between Canada and the US
* ]ese ] country code{{cn|date=May 2018}}
* The number of the French department ]

==See also==
* ]


==References== ==References==
Line 105: Line 85:
{{Integers|zero}} {{Integers|zero}}


{{DEFAULTSORT:50 (Number)}} {{DEFAULTSORT:49 (Number)}}
] ]

Latest revision as of 01:56, 7 January 2025

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed.
Find sources: "49" number – news · newspapers · books · scholar · JSTOR (May 2016) (Learn how and when to remove this message)
Natural number
← 48 49 50 →
← 40 41 42 43 44 45 46 47 48 49 → ← 0 10 20 30 40 50 60 70 80 90 →
Cardinalforty-nine
Ordinal49th
(forty-ninth)
Factorization7
Divisors1, 7, 49
Greek numeralΜΘ´
Roman numeralXLIX, xlix
Binary1100012
Ternary12113
Senary1216
Octal618
Duodecimal4112
Hexadecimal3116

49 (forty-nine) is the natural number following 48 and preceding 50.

In mathematics

Forty-nine is the square of the prime number seven and hence the fourth non-unitary square prime of the form p.

It appears in the Padovan sequence, preceded by the terms 21, 28, 37 (it is the sum of the first two of these).

Along with the number that immediately derives from it, 77, the only number under 100 not having its home prime known (as of 2016).

The smallest triple of three squares in arithmetic succession is (1,25,49), and the second smallest is (49,169,289).

49 is the smallest discriminant of a totally real cubic field.

49 and 94 are the only numbers below 100 whose all permutations are composites but they are not multiples of 3, repdigits or numbers which only have digits 0, 2, 4, 5, 6 and 8, even excluding the trivial one digit terms.

49 = 7^2 and 94 = 2 * 47

The number of prime knots with 9 crossings is 49.

Decimal representation

The sum of the digits of the square of 49 (2401) is the square root of 49.

49 is the first square where the digits are squares. In this case, 4 and 9 are squares.

Reciprocal

See also: Repeating decimal

The fraction ⁠1/49⁠ is a repeating decimal with a period of 42:

⁠1/49⁠ = 0.0204081632 6530612244 8979591836 7346938775 51 (42 digits repeat)

There are 42 positive integers less than 49 and coprime to 49. (42 is the period.) Multiplying 020408163265306122448979591836734693877551 by each of these integers results in a cyclic permutation of the original number:

  • 020408163265306122448979591836734693877551 × 2 = 040816326530612244897959183673469387755102
  • 020408163265306122448979591836734693877551 × 3 = 061224489795918367346938775510204081632653
  • 020408163265306122448979591836734693877551 × 4 = 081632653061224489795918367346938775510204
  • ...

The repeating number can be obtained from 02 and repetition of doubles placed at two places to the right: 

02
  04
    08
      16
        32
          64
           128
             256
               512
                1024
                  2048
+                   ...
----------------------
020408163265306122448979591836734693877551...0204081632...

because 1⁄49 satisfies:

x = 1 50 + 2 x 100 = 1 50 ( 1 + x ) . {\displaystyle x={\frac {1}{50}}+{\frac {2x}{100}}={\frac {1}{50}}(1+x)\,.}

In chemistry

  • During the Manhattan Project, plutonium was also often referred to simply as "49". Number 4 was for the last digit in 94 (atomic number of plutonium) and 9 for the last digit in Pu-239, the weapon-grade fissile isotope used in nuclear bombs.

In religion

In other fields

Forty-nine is:

  • 49er, one who participated in the 1849 California Gold Rush. This meaning has endured and things continue to be referred to as "49er," such as a member of the San Francisco 49ers team of the National Football League.
  • A 49 is a party after a powwow or any gathering of American Indians, held by the participants. It is also type of song that is sung on such occasions. A 49 is typically held in an isolated place and features drumming and singing.

References

  1. "Sloane's A000931 : Padovan sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  2. Sloane, N. J. A. (ed.). "Sequence A006832 (Discriminants of totally real cubic fields.)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2024-03-20.
  3. Sloane, N. J. A. (ed.). "Sequence A002863 (Number of prime knots with n crossings)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  4. Hammel, E.F. (2000). "The taming of "49" — Big Science in little time. Recollections of Edward F. Hammel, pp. 2-9. In: Cooper N.G. Ed. (2000). Challenges in Plutonium Science" (PDF). Los Alamos Science. 26 (1): 2–9.
  5. Hecker, S.S. (2000). "Plutonium: an historical overview. In: Challenges in Plutonium Science". Los Alamos Science. 26 (1): 1–2.
  6. "Forty-nine dance". Encyclopedia Britannica. Retrieved May 25, 2018.
Integers
−1
0s
  •  0 
  •  1 
  •  2 
  •  3 
  •  4 
  •  5 
  •  6 
  •  7 
  •  8 
  •  9 
100s
200s
300s
400s
500s
600s
700s
800s
900s
1000s
Category: