85 (number): Difference between revisions
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* the product of two [[prime number]]s (5 and 17), and is therefore a [[semiprime|biprime]]; specifically, the 24th biprime not counting perfect squares. Together with 86 and 87, it forms the second cluster of three consecutive biprimes. |
* the product of two [[prime number]]s (5 and 17), and is therefore a [[semiprime|biprime]]; specifically, the 24th biprime not counting perfect squares. Together with 86 and 87, it forms the second cluster of three consecutive biprimes. |
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* an [[octahedral number]].<ref>{{Cite web|url=https://oeis.org/A005900|title=Sloane's A005900 : Octahedral numbers |
* an [[octahedral number]].<ref>{{Cite web|url=https://oeis.org/A005900|title=Sloane's A005900 : Octahedral numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-29}}</ref> |
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* a [[centered triangular number]].<ref>{{Cite web|url=https://oeis.org/A005448|title=Sloane's A005448 : Centered triangular numbers |
* a [[centered triangular number]].<ref>{{Cite web|url=https://oeis.org/A005448|title=Sloane's A005448 : Centered triangular numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-29}}</ref> |
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* a [[centered square number]].<ref>{{Cite web|url=https://oeis.org/A001844|title=Sloane's A001844 : Centered square numbers |
* a [[centered square number]].<ref>{{Cite web|url=https://oeis.org/A001844|title=Sloane's A001844 : Centered square numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-29}}</ref> |
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* a [[decagonal number]].<ref>{{Cite web|url=https://oeis.org/A001107|title=Sloane's A001107 : 10-gonal (or decagonal) numbers |
* a [[decagonal number]].<ref>{{Cite web|url=https://oeis.org/A001107|title=Sloane's A001107 : 10-gonal (or decagonal) numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-29}}</ref> |
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* the smallest number that can be expressed as a [[Fermat's theorem on sums of two squares|sum of two squares]], with all squares greater than 1, in two ways, 85 = 9<sup>2</sup> + 2<sup>2</sup> = 7<sup>2</sup> + 6<sup>2</sup>.<ref>{{Cite OEIS|A007692}}. Note that 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.</ref> |
* the smallest number that can be expressed as a [[Fermat's theorem on sums of two squares|sum of two squares]], with all squares greater than 1, in two ways, 85 = 9<sup>2</sup> + 2<sup>2</sup> = 7<sup>2</sup> + 6<sup>2</sup>.<ref>{{Cite OEIS|A007692}}. Note that 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.</ref> |
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* the length of the hypotenuse of four [[pythagorean triple|pythagorean triangles]]. |
* the length of the hypotenuse of four [[pythagorean triple|pythagorean triangles]]. |
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* a [[Smith number]] in decimal.<ref>{{Cite web|url=https://oeis.org/A006753|title=Sloane's A006753 : Smith numbers |
* a [[Smith number]] in decimal.<ref>{{Cite web|url=https://oeis.org/A006753|title=Sloane's A006753 : Smith numbers|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-05-29}}</ref> |
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==In astronomy== |
==In astronomy== |
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Revision as of 15:41, 3 December 2020
85 (eighty-five) is the natural number following 84 and preceding 86.
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|---|---|---|---|---|
| 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
85 is:
- the product of two prime numbers (5 and 17), and is therefore a biprime; specifically, the 24th biprime not counting perfect squares. Together with 86 and 87, it forms the second cluster of three consecutive biprimes.
- an octahedral number.[1]
- a centered triangular number.[2]
- a centered square number.[3]
- a decagonal number.[4]
- 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.[5]
- the length of the hypotenuse of four pythagorean triangles.
- a Smith number in decimal.[6]
In astronomy
- 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
- 85P/Boethin is a periodic comet
In titles and names
- 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
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
- The year AD 85, 85 BC, or 1985.
- The Muslim calendar year 85 AH.
- The atomic number of 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".
In military technology
- 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
- List of highways numbered 85
- List of highways numbered 85A
- Type 85, a designation of many military equipment
References
- ^ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- ^ "Sloane's A005448 : Centered triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- ^ "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- ^ "Sloane's A001107 : 10-gonal (or decagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
- ^ Sloane, N. J. A. (ed.). "Sequence A007692". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation.. Note that 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's A006753 : Smith numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
External links
Wikimedia Commons has media related to 85 (number).
- 85
- Jorge Stolfi, The Hollywood Constant.