85 (number)

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85 (eighty-five) is the natural number following 84 and preceding 86.

← 80 81 82 83 84 85 86 87 88 89 → List of numbers — Integers 0 10 20 30 40 50 60 70 80 90 →
Cardinal	85 eighty-five
Ordinal	85th eighty-fifth
Factorization	$5 \cdot 17$
Divisors	1, 5, 17, 85
Roman numeral	LXXXV
Binary	01010101
Hexadecimal	55

1 In mathematics
2 In astronomy
3 In other fields
4 In sports
- 4.1 External links

[edit] In mathematics

Eighty-five is the twenty-fourth distinct biprime and the fourth of the form (5.q). The aliquot sum of 85 is 23 within the aliquot sequence (23,1,0) 85 being the second composite number in the 23-aliquot tree.

85 is the first number in the second cluster of three discrete biprimes with subsequent 86 and 87 being themselves discrete biprimes.

Eighty-five is an octahedral number, a centered triangular number, a centered square number, a decagonal number, and a Smith number.

85 can be expressed as a sum of two squares in two ways, 85= 9² + 2² = 7² + 6²

85 is a repdigit in base 4 (1111), being the case 5×17 of a product of two consecutive Fermat primes. (The known Fermat primes are 3, 5, 17, 257, and 65,537.) Every such product is 1111 in base one less than the smaller of its two prime factors.

[edit] In astronomy

Messier object M85, a magnitude 10.5 lenticular galaxy in the constellation Coma Berenices
The New General Catalogue object NGC 85, a galaxy in the constellation Andromeda
The Saros number of the solar eclipse series which began on -170 March 14 and ended on 1110 April 20. The duration of Saros series 85 was 1280.1 years, and it contained 72 solar eclipses. Further, the Saros number of the lunar eclipse series which began on -103 August 2 and ended on 1267 November 3. The duration of Saros series 85 was 1370.3 years, and it contained 77 lunar eclipses.

[edit] In other fields

Published in Brazil:
ISBN: 85..

Eighty-five is also:

The atomic number of astatine
The model number of SU-85
The number of the French department Vendée
The designation of Interstate 85, a U.S. freeway that runs from Alabama to Virginia
The European route E85 from Klaipėda to Alexandropoúli
The ISBN Group Identifier for books published in Brazil
Number 85 is a webcomic novel created by Gemma Bright and Tammy Holliday.
The year AD 85, 85 BC, or 1985.
The smallest positive integer not used in the title of a movie (as of 2005)
E85 gas is 85% ethanol and 15% conventional gas
The 85 Ways to Tie a Tie, a book by Thomas Fink and Yong Mao
The radix of the Ascii85 (sometimes called Base85) binary-to-text encoding
"85 Days: The Last Campaign of Robert Kennedy" a book by Jules Witcover
Batman: the Animated Series ran on Fox from 1992–95 for 85 episodes
Thirtysomething ran on ABC from 1987–91 for 85 episodes

[edit] In sports

MLB

Pitchers who pitched 85 games in a single season include Kent Tekulve (1982); Mitch Williams and Frank Williams (1987); Jon Rauch and Matt Capps (2006)
St. Louis Cardinals retired #85 for former owner August Busch, Jr. (age 85 in 1984).
85 is the highest uniform number retired in all of baseball

NFL