55 (number)

← 54 55 56 →
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Cardinal fifty-five
Ordinal 55th
(fifty-fifth)
Factorization 5 × 11
Divisors 1, 5, 11, 55
Greek numeral ΝΕ´
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

Astronomy

Music

  • "Schfifty Five", a song produced by Gröûp X.[7]
  • 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
  • Ol' 55 (band), an Australian rock band.
  • Primer 55 an American band
  • Station 55, an album released in 2005 by Cristian Vogel
  • 55 Cadillac, an album by Andrew W.K.

Transportation

  • In the United States, the National Maximum Speed Law prohibited speed limits higher than 55 miles per hour (90 km/h) from 1974 to 1987

Film

Years

Other uses

See also

References

  1. ↑ "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  2. ↑ "Sloane's A000217 : Triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  3. ↑ "Sloane's A000330 : Square pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  4. ↑ "Sloane's A000566 : Heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  5. ↑ "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.
  6. ↑ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  7. ↑ "Group X". Albino Blacksheep. Retrieved 30 July 2018.
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