85 (eighty-five) is the natural number following 84 and preceding 86.
| ||||
---|---|---|---|---|
Cardinal | eighty-five | |||
Ordinal | 85th (eighty-fifth) | |||
Factorization | 5 × 17 | |||
Divisors | 1, 5, 17, 85 | |||
Greek numeral | ΠΕ´ | |||
Roman numeral | LXXXV | |||
Binary | 10101012 | |||
Ternary | 100113 | |||
Senary | 2216 | |||
Octal | 1258 | |||
Duodecimal | 7112 | |||
Hexadecimal | 5516 |
In mathematics
[edit]85 is:
- the product of two prime numbers (5 and 17), and is therefore a semiprime of the form (5.q) where q is prime.
- specifically, the 24th Semiprime, it being the fourth of the form (5.q).
- together with 86 and 87, forms the second cluster of three consecutive semiprimes; the first comprising 33, 34, 35.[1]
- with a prime aliquot sum of 23 in the short aliquot sequence (85,23,1,0).
- an octahedral number.[2]
- a centered triangular number.[3]
- a centered square number.[4]
- a decagonal number.[5]
- the smallest number that can be expressed as a sum of two squares, with all squares greater than 1, in two ways, 85 = 92 + 22 = 72 + 62.[6]
- the length of the hypotenuse of four Pythagorean triangles.
- a Smith number in decimal.[7]
In astronomy
[edit]- Messier object M85 is a magnitude 10.5 lenticular galaxy in the constellation Coma Berenices
- NGC 85 is a galaxy in the constellation Andromeda
- 85 Io is a large main belt asteroid
- 85 Pegasi is a multiple star system in constellation of Pegasus
- 85 Ceti is a variable star in the constellation of Cetus
- 85D/Boethin is a periodic comet
In titles and names
[edit]- Federalist No. 85, by Alexander Hamilton, the last of The Federalist Papers (1788)
- The 85 Ways to Tie a Tie, a book by Thomas Fink and Yong Mao
- 85 Days: The Last Campaign of Robert Kennedy, a book by Jules Witcover
- Live/1975–85, an album of live recordings by Bruce Springsteen (1986)
- 80–85, a compilation album by Bad Religion (1991)
- Cupid & Psyche 85, an album by band Scritti Politti (1985)
- 45/85 was a television documentary on World War II
- Minuscule 85, Papyrus 85, Lectionary 85 are early Greek manuscripts of the New Testament
- "85", a 2000 rap single by YoungBloodz, from their album Against Da Grain
- 85°C, a Taiwanese coffee store chain.
In sports
[edit]In U.S. college athletics, schools that are members of NCAA Division I are limited to providing athletic scholarships to a maximum of 85 football players in a given season. The specifics vary by the two Division I football subdivisions:
- In the top-level FBS, each player provided with a scholarship may, and almost always does, receive a full scholarship.
- In the second-level FCS, schools are allowed to provide football-related athletic aid equivalent to 63 full scholarships, but this aid may be divided among up to 85 players as the schools see fit.
In other fields
[edit]- The year AD 85, 85 BC, or 1985.
- The Muslim calendar year 85 AH.
- The atomic number of the chemical element astatine
- The number of the French department Vendée
- The ISBN Group Identifier for books published in Brazil
- The radix of the Ascii85 (sometimes called Base85) binary-to-text encoding
- The IQ and nickname of Aaron in Alien 3
- The number worn by Chad Ochocinco, whose name means "eight five" in Spanish
- Arabigere 85 is a village in India
- E85 fuel is 85% ethanol and 15% conventional gasoline
- MCS-85 was a family of Intel processors including the 8085
- TI-85 was a graphing pocket calculator by Texas Instruments
- KC 85 was a family of small computers built in East Germany in the 1980s
- PMD 85 was a personal computer built in Czechoslovakia in 1985
- Learjet 85 is an all-composite plane being developed by Bombardier Aerospace
- British Rail Class 85, a category of UK train locomotives
- DRG Class 85, a category of German train locomotives
- TK85 was a clone of the Sinclair ZX81 made in Brazil in 1983
- Lima Site 85 was a battle in the Vietnam War
- A85 is the Dutch Defence in the Encyclopaedia of Chess
- EF 85mm is a photographic camera lens by Canon
- F85 (disambiguation), multiple uses
- Part of the assignation for the Toyota AE85, commonly referred to as an "eight-five".
- KiHa 85 series is a diesel Limited express train that ran in Japan until 2023.
- HC85 series is the successor of KiHa 85 and is a hybrid diesel limited express train.
In military technology
[edit]- 85mm is a common caliber for cannons
- SU-85 was a Soviet tank
- TR-85 was a Romanian battle tank
- Tu-85 was a prototype Soviet bomber
- ASU-85 a Soviet self-propelled gun
- CZ 85 is a Czech 9mm semiautomatic pistol
- PT-85 is a Korean tank
- 7.62 Tkiv 85 is a Finnish army rifle
- HG 85 is a Swiss fragmentation grenade
- Taurus Model 85, a 9mm revolver made in Brazil
See also
[edit]References
[edit]- ^ Sloane, N. J. A. (ed.). "Sequence A056809 (Numbers k such that k, k+1 and k+2 are products of two primes)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005900 (Octahedral numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A005448 (Centered triangular numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A001844 (Centered square numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A001107 (10-gonal (or decagonal) numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
- ^ Sloane, N. J. A. (ed.). "Sequence A007692 (Numbers that are the sum of 2 non-zero squares in 2 or more ways)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.. The two smaller numbers on this list, 50 and 65, have 1 as one of the squares in their representations as sums of two squares.
- ^ Sloane, N. J. A. (ed.). "Sequence A006753 (Smith numbers)". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.
External links
[edit]- 85
- Jorge Stolfi, The Hollywood Constant.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction