55 (number)

← 54 55 56 →
Cardinalfifty-five
Ordinal55th
(fifty-fifth)
Factorization5 × 11
Divisors1, 5, 11, 55
Greek numeralΝΕ´
Roman numeralLV, lv
Binary1101112
Ternary20013
Senary1316
Octal678
Duodecimal4712
Hexadecimal3716

55 (fifty-five) is the natural number following 54 and preceding 56.

Mathematics

55 is composite number,[1] and a Fibonacci number.[2]

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. The number 55 became a popular shorthand for the 55 mph speed limit. For example, a hand with a pair of fives in Texas hold'em poker is referred to as a "speed limit".[3]

References

  1. ^ "A002808 - OEIS". oeis.org. Retrieved 2024-11-20.
  2. ^ "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.
  3. ^ McComas, Richard (2004-12-05). "400+ Hole Card Hand Names". Retrieved 2008-10-11.
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