# 85 (number)

Jump to: navigation, search

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

 ← 84 85 86 →
Cardinal eighty-five
Ordinal 85th
(eighty-fifth)
Factorization 5 × 17
Divisors 1, 5, 17, 85
Roman numeral LXXXV
Binary 10101012
Ternary 100113
Quaternary 11114
Quinary 3205
Senary 2216
Octal 1258
Duodecimal 7112
Hexadecimal 5516
Vigesimal 4520
Base 36 2D36

## In mathematics

85 is:

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.

## 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 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

## References

1. ^ "Sloane's A005900 : Octahedral numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
2. ^ "Sloane's A005448 : Centered triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
3. ^ "Sloane's A001844 : Centered square numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
4. ^ "Sloane's A001107 : 10-gonal (or decagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
5. ^ "Sloane's 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.
6. ^ "Sloane's A006753 : Smith numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.