55 (number)
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Cardinal | fifty-five | |||
Ordinal |
55th (fifty-fifth) | |||
Factorization | 5 × 11 | |||
Divisors | 1, 5, 11, 55 | |||
Roman numeral | LV | |||
Binary | 1101112 | |||
Ternary | 20013 | |||
Quaternary | 3134 | |||
Quinary | 2105 | |||
Senary | 1316 | |||
Octal | 678 | |||
Duodecimal | 4712 | |||
Hexadecimal | 3716 | |||
Vigesimal | 2F20 | |||
Base 36 | 1J36 |
55 (fifty-five) is the natural number following 54 and preceding 56.
Mathematics
55 is the 10th Fibonacci number[1] and a triangular number (the sum of the consecutive numbers 1 to 10).[2] It is the largest Fibonacci number to also be a triangular number.
It is a square pyramidal number (the sum of the squares of the integers 1 to 5)[3] as well as a heptagonal number,[4] and a centered nonagonal number.[5]
In base 10, it is a Kaprekar number.[6]
Science
- The atomic number of caesium.
Astronomy
- Messier object M55, a magnitude 7.0 globular cluster in the constellation Sagittarius
- The New General Catalogue object NGC 55, a magnitude 7.9 barred spiral galaxy in the constellation Sculptor
Music
- A song produced by Group X was called "Schfifty Five".
- The name of a song by British Indie Rock Band Kasabian. The song was released as a B side to Club Foot and was recorded live when the band performed at London's Brixton Academy.
- I Can't Drive 55, a song by Sammy Hagar
- Ol' '55, a song by Tom Waits
- Cristian Vogel released an album in 2005 with the title "Station 55"
- Ol' 55 (band), an Australian rock band.
- Primer 55 an American band
- 55 Cadillac, an album by Andrew W.K.
Transportation
- The highest speed limit allowed in the United States between 1974 and 1986 per the National Maximum Speed Law.
- Highway 55, several roads
Film
- 55 Days at Peking a film starring Charlton Heston and David Niven
Years
Other uses
- Gazeta 55, an Albanian newspaper
- Agitation and Propaganda against the State, also known as Constitution law 55, a law during Communist Albania.
- The code for international direct dial phone calls to Brazil
- A 55-gallon drum; see 44 gallon drum
- Numbered car in NASCAR, currently being driven by David Ragan
- The Élysée, the official residency of the French Republic president, which address is 55 rue du Faubourg-Saint-Honoré in Paris.
- The number of the laps of the Abu Dhabi Grand Prix.
See also
- 55th Regiment of Foot (disambiguation)
- Channel 55 (disambiguation)
- Type 55 (disambiguation)
- Class 55 (disambiguation)
- Highway 55
References
- ↑ "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- ↑ "Sloane's A000217 : Triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- ↑ "Sloane's A000330 : Square pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- ↑ "Sloane's A000566 : Heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- ↑ "Sloane's A060544 : Centered 9-gonal (also known as nonagonal or enneagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
- ↑ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
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