From Wikipedia, the free encyclopedia
85 (eighty-five ) is the
natural number following
84 and preceding
86 .
Natural number
In mathematics
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
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
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
References
^
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
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