Английская Википедия:145 (number)
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145 (one hundred [and] forty-five) is the natural number following 144 and preceding 146.
In mathematics
- Although composite, 145 is a Fermat pseudoprime to sixteen bases with b < 145. In four of those bases, it is a strong pseudoprime: 1, 12, 17, and 144.
- Given 145, the Mertens function returns 0.[1]
- 145 is a pentagonal number[2] and a centered square number.[3]
- <math>145 = 12^2 + 1^2 = 8^2 + 9^2</math>. 145 is the fourth number that is the sum of two different pairs of squares. Also, 145 is the result of 34 + 43, making it a Leyland number.
- <math>145 = 1! + 4! + 5!</math>, making it a factorion.[4] The only other numbers that have the property that they are the sum of the factorials of their digits are 1, 2 and 40585.[4]
- <math>145=5^2+5!=11^2+4!=12^2+1!</math>, making 145 the smallest number that can be written as the sum of a perfect square and a factorial in exactly 3 distinct ways. The next number with this property is 46249.[5]
In the military
- Шаблон:USS was a United States Navy Шаблон:Sclass during World War II
- Шаблон:USS was a United States Navy Шаблон:Sclass during World War II
- Шаблон:USS was a United States Navy Шаблон:Sclass during World War II
- Шаблон:USS was a United States Navy Шаблон:Sclass during World War II
- Шаблон:USS was a United States Navy Шаблон:Sclass during World War II
- Шаблон:USS was a United States Navy Шаблон:Sclass following World War II
In sports
- The Grand Union Canal Race is a 145-mile ultramarathon from Birmingham to London along the Grand Union Canal
In transportation
- Eurocopter EC 145 is a twin-engine light utility helicopter
- The Delahaye 145 Sports Car from 1938[6]
- The Alfa Romeo 145 car produced between 1994 and 2001
- Volvo 145 Express station wagon
- ERJ 145 regional jets produced by Embraer
- Golden Gate Transit Bus Route 145[7]
- London Bus Route 145[8]
In other fields
145 is also:
- The year AD 145 or 145 BC
- 145 AH is a year in the Islamic calendar that corresponds to 762 – 763 CE
- 145 Adeona is a large main belt asteroid
- Psalm 145
- Sonnet 145
- Apple Computer laptops, such as the PowerBook 145 and PowerBook 145B
- Puff Daddy song “Picture it” includes the lyrics “in something foreign soarin’ 145”
- Tsuu T'ina Nation 145 Indian reserve in Alberta, Canada
- 145 mg medicine tablets, as with Tricor
- "One Four Five" is a song by The Cat Empire
See also
- List of highways numbered 145
- United Nations Security Council Resolution 145
- United States Supreme Court cases, Volume 145
References
- Wells, D. The Penguin Dictionary of Curious and Interesting Numbers London: Penguin Group. (1987): 140
External links
