145 (number)

← 144 145 146 →
← 140 141 142 143 144 145 146 147 148 149 → List of numbers — Integers ← 0 100 200 300 400 500 600 700 800 900 →
Cardinal	one hundred forty-five
Ordinal	145th (one hundred and forty-fifth)
Factorization	5 × 29
Divisors	1, 5, 29, 145
Roman numeral	CXLV
Binary	100100012
Ternary	121013
Quaternary	21014
Quinary	10405
Senary	4016
Octal	2218
Duodecimal	10112
Hexadecimal	9116
Vigesimal	7520
Base 36	4136

145 (one hundred [and] forty-five) is the natural number following 144 and preceding 146.

In mathematics

• Although composite, 145 is a pseudoprime.
• Given 145, the Mertens function returns 0.
• 145 is a pentagonal number and a centered square number.
• $145 = 12^2 + 1^2 = 8^2 + 9^2$. 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.
• $145 = 1! + 4! + 5!$, making it a factorion. The only other numbers that have the property that they are the sum of the factorials of their digits are 1, 2 and 40585.

In the military

• USS Armada (AM-145) was a United States Navy Admirable minesweeper ship during World War II
• USS Colbert (APA-145) was a United States Navy Haskell class attack transport during World War II
• USS General Harry Taylor (AP-145) was a United States Navy General G. O. Squier transport ship during World War II
• USS Greer (DD-145) was a United States Navy Wickes class destroyer during World War II
• USS Huse (DE-145) was a United States Navy Edsall class destroyer during World War II
• USS Roanoke (CL-145) was a United States Navy cruiser 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
• 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
• London Bus Route 145

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”
• 145th Street blues band
• Tsuu T'ina Nation 145 Indian reserve in Alberta, Canada
• The 2004 film “Love and 145 Watts” starring Jessica Baxter
• 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

• The Natural Number 145
• Parker, Matt. "145 and the Melancoil". Numberphile. Brady Haran.