155 (one hundred ndfifty-five) is the

natural number In mathematics, the natural numbers are those numbers used for counting (as in "there are ''six'' coins on the table") and ordering (as in "this is the ''third'' largest city in the country"). Numbers used for counting are called ''cardinal ...

following

154 Year 154 ( CLIV) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Aurelius and Lateranus (or, less frequently, year 907 '' Ab urbe con ...

and preceding

156 Year 156 (Roman numerals, CLVI) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Silvanus and Augurinus (or, less frequently, year 90 ...

In mathematics

155 is: *a

composite number A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Equivalently, it is a positive integer that has at least one divisor other than 1 and itself. Every positive integer is composite, prime, ...

semiprime In mathematics, a semiprime is a natural number that is the product of exactly two prime numbers. The two primes in the product may equal each other, so the semiprimes include the squares of prime numbers. Because there are infinitely many prime ...

. *a

deficient number In number theory, a deficient number or defective number is a number ''n'' for which the sum of divisors of ''n'' is less than 2''n''. Equivalently, it is a number for which the sum of proper divisors (or aliquot sum) is less than ''n''. For ex ...

, since 1+ 5+ 31= 37<155. * odious, since its binary expansion

10011011_2

has a total of 5 ones in it. There are 155 primitive permutation groups of degree 81. If one adds up all the primes from the least through the greatest prime factors of 155, that is, 5 and 31, the result is 155. Only three other "small" semiprimes (10, 39, and 371) share this attribute.

In the military

* was a

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

''Admirable''-class minesweeper during

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...

* was a United States Navy ''Wickes''-class destroyer during World War II * was a United States Navy ''General G. O. Squier''-class transport during World War II * was a United States Navy ''Buckley''-class destroyer escort during World War II * was a United States Navy during World War II * was a United States Navy four-master wooden schooner during World War II * 155mm artillery, a common caliber

In sports

* The maximum possible score in a single break in snooker, with a free ball at the start of the break ( 147 is the highest possible without a free ball)

In transportation

Alfa Romeo 155 The Alfa Romeo 155 (Type 167) is a compact executive car produced by Italian automobile manufacturer Alfa Romeo between 1992 and 1998. It was unveiled in January 1992 at Barcelona, with the first public launch in March 1992, at the Geneva Motor S ...

, a

compact executive car A compact executive car, also known as a compact luxury car, is a premium car larger than a premium compact and smaller than an executive car. Compact executive car is a UK term and a part of the D-segment in the European car classification. A ...

produced from 1992 to 1998
Seattle Bus Route 155

* The

British Rail Class 155 The British Rail Class 155 is a diesel multiple unit passenger train. These DMUs were built by Leyland Bus at Workington (incorporating some Leyland National bus components) between 1987 and 1988 as part of BR's replacement of its ageing fir ...

is a diesel multiple unit

British British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, ...

train In rail transport, a train (from Old French , from Latin , "to pull, to draw") is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives (often ...

* Blériot 155 was a French airliner of the 1920s * 155th Street, Manhattan, New York * 155th Street New York City Subway stations: ** 155th Street (IND Concourse Line) ** 155th Street (IND Eighth Avenue Line) **

155th Street (IRT Ninth Avenue Line) The 155th Street station was an elevated railway station in Manhattan, New York City, that operated from 1870 until 1958. It served as the north terminal of the IRT Ninth Avenue Line from its opening until 1918 and then as the southern termina ...

(former)

In other fields

155 is also: * The year AD 155 or 155 BC * 155 is the number for the International Operator in the United Kingdom * 155 AH is a year in the

Islamic calendar The Hijri calendar ( ar, ٱلتَّقْوِيم ٱلْهِجْرِيّ, translit=al-taqwīm al-hijrī), also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 ...

that corresponds to 771 – 772 CE *

155 Scylla Scylla ( minor planet designation: 155 Scylla) is a main belt asteroid. It was discovered by Austrian astronomer Johann Palisa at the Austrian Naval Observatory on 8 November 1875, and named after the monster Scylla in Greek mythology. Two we ...

is a

main belt The asteroid belt is a torus-shaped region in the Solar System, located roughly between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies, of many sizes, but much smaller than planets, called ...

asteroid * Europium-155 is a

radioisotope A radionuclide (radioactive nuclide, radioisotope or radioactive isotope) is a nuclide that has excess nuclear energy, making it unstable. This excess energy can be used in one of three ways: emitted from the nucleus as gamma radiation; transferr ...

or Europium and fission product with a

half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable at ...

of 4.76 years *

155 Year 155 ( CLV) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Rufinus (or, less frequently, year 908 ''Ab urbe condita'' ...

, a 2007 song by the band +44 * The dialing code for Obihiro, Japan * The

atomic number The atomic number or nuclear charge number (symbol ''Z'') of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei, this is equal to the proton number (''n''p) or the number of protons found in the nucleus of every ...

of an element temporarily calle
unquintquinttium
*

155 North Wacker 155 North Wacker is a 48-story skyscraper located in Chicago, Illinois designed by Goettsch Partners and was developed by the John Buck Company.skyscraper in

Chicago (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name ...

* Wolseley No. 155, Saskatchewan is a rural municipality in

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

References

External links

{{DEFAULTSORT:155 (Number) Integers