Contents

### Miscellaneous

**83** is the **atomic number of bismuth (symbol Bi)**.

In **Judaism**, when someone reaches **83 years old** they may celebrate a **second bar mitzvah**. The Torah says that a normal lifespan is 70 years, so an 83-year-old person can be considered 13 years old in a second lifetime.

**83** is the **highest UHF channel on older televisions** made before the late 1970s (newer televisions only go up to channel 69, due to the frequency spectrum previously assigned to channels 70–83 in the USA being reassigned to cellular phone service there in the late 1970s–early 1980s).

The **83rd day of the year** in the **Gregorian calendar** is **March 24** in **non-leap years**, **March 23** in **leap years**.

The **Bell XP-83** (later redesignated **ZXF-83**) was a United States **prototype escort fighter** designed by Bell Aircraft during World War II. It first flew in 1945. As an early jet fighter, its limitations included a lack of power and it was soon eclipsed by more advanced designs.

The **B83** **thermonuclear bomb** is a variable-yield gravity bomb developed by the United States in the late 1970s, entering service in 1983. With a maximum yield of 1.2 megatonnes of TNT (75 times the yield of the atomic bomb “Little Boy” dropped on Hiroshima on August 6, 1945, which had a yield of 16 kilotonnes of TNT), it is the **most powerful nuclear free-fall weapon in the United States arsenal**. The first underground test detonation of the production B83 took place on December 15, 1984.

**HLA-B*83** (**B83**) is an **HLA-B allele-group** composed of a single allele, B*8301. There is no useful serology associated with this allele. It is found in a single **Mbenzele Pygmy tribe** of the Central Africa Republic.

**Interstate 83** (abbreviated **I-83**) is an Interstate Highway in the Eastern United States that runs from Baltimore, Maryland to Harrisburg, Pennsylvania.

**83** is the **ISBN Group Identifier** for **books published in Poland**. The **International Standard Book Number** (ISBN) is a unique numeric commercial book identifier assigned to each edition and variation (except reprintings) of a book. For example, an e-book, a paperback and a hardcover edition of the same book would each have a different ISBN. The ISBN is 10 digits long if it was assigned on or before December 31, 2006 and 13 digits long if assigned on or after January 1, 2007.

**83** is slang for a **bisexual person**. It is derived from the atomic number of bismuth which has the symbol **Bi**.

**83** is a **glasses-wearing variation of the :3 emoticon**. The :3 emoticon represents the cat face made by anime characters when they say something clever or sarcastic, or are commenting on something cute.

### Prime Numbers

**83** is a **prime number**. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.

**83** is the **23rd prime number**. 23 is also a prime number. The previous prime number is 79 and the next prime number is 89.

79 and **83** are **cousin primes**. Cousin primes are prime numbers that differ by four. Twin primes are pairs of prime numbers that differ by two, and sexy primes are pairs of prime numbers that differ by six. The term “sexy prime” stems from the Latin word for six: *sex*.

**83** is the **sum of three consecutive prime numbers**: 23 + 29 + 31.

**83** is the **sum of five consecutive primes**: 11 + 13 + 17 + 19 + 23.

### Astronomy

**Messier object M83**, also known as the **Southern Pinwheel galaxy**, is a **magnitude 8.5**, **barred spiral galaxy**, **15 million light-years away** in the constellation **Hydra**. M83 is classified as a barred spiral galaxy due to the bar-like pattern of stars that run through its center, very similar in structure to our own Milky Way galaxy. More info.

**New General Catalogue object NGC 83** is a **magnitude 14.2**, **a lenticular galaxy**, **285–330 million light-years away** in the constellation **Andromeda**. NGC 83 was discovered by John Herschel on August 17, 1828. More info.

**Solar eclipse saros series 83** contained 71 solar eclipses over a period of 1,262.11 years, beginning on May 5, 210 BCE and ended on May 30, 1052. More info.

**Lunar eclipse saros series 83** contained 84 lunar eclipses over a period of 1,496.50 years, beginning on August 22, 197 BCE and ended on February 5, 1300. More info.

The **saros** is a period of approximately 223 synodic months (approximately 6,585.3211 days, or 18 years, 11 days, 8 hours), that can be **used to predict eclipses of the Sun and Moon**. One saros period after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, a near straight line, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle. A **sar** is one half of a saros. A series of eclipses that are separated by one saros is called a **saros series**.

### In Other Number Systems

**83** in Roman numerals is **LXXXIII**.

**83** in binary (base 2) is **1010011 _{2}**.

**83** in ternary (base 3) is **10002 _{3}**.

**83** in quaternary (base 4) is **1103 _{4}**.

**83** in quinary (base 5) is **313 _{5}**.

**83** in senary (base 6) is **215 _{6}**.

**83** in octal (base 8) is **123 _{8}**.

**83** in duodecimal (base 12) is **6B _{12}**.

**83** in hexadecimal (base 16) is **53 _{16}**.

**83** in vigesimal (base 20) is **43 _{20}**.

**83** in base 36 is **2B _{36}**.

### Mathematics

**83** is both a **Sophie Germain prime** and a **safe prime**. A prime number p is a Sophie Germain prime if 2p + 1 is also prime. The number 2p + 1 associated with a Sophie Germain prime is called a safe prime.

As a Sophie Germain prime, 2 × **83** + 1 = 167 (167 is the safe prime).

As a safe prime, 2 × 41 + 1 = **83** (41 is the Sophie Germain prime)

**83** is a **Chen prime**. A prime number p is called a Chen prime if p + 2 is either a prime or a product of two primes (also called a **semiprime**). The even number 2p + 2 therefore satisfies Chen’s theorem. The lower member of a pair of twin primes is by definition a Chen prime.

**83** is an **Eisenstein prime** with no imaginary part and real part of the form 3n – 1. An Eisenstein prime is an Eisenstein integer

z = a + bω (ω = e^{2πi/3})

that is irreducible (or equivalently prime) in the ring-theoretic sense: its only Eisenstein divisors are the units (±1, ±ω, ±ω^{2}), a + bω itself and its associates. The associates (unit multiples) and the complex conjugate of any Eisenstein prime are also prime.

**83** is a **highly cototient number**. A highly cototient number is a positive integer k which is above one and has more solutions to the equation

x – φ(x) = k,

than any other integer below k and above one. Here, φ is Euler’s totient function.

### In Other Languages

In **Afrikaans** eighty-three is **drie en tagtig**.

In **Albanian** eighty-three is **tetëdhjetë e tre**.

In **Amharic** eighty-three is **የሰማንያ ሦስት** (_____).

In **Arabic** eighty-three is **ثلاث وثمانون** (thlath wathamanun).

In **Armenian** eighty-three is **ութսուներեք** (ut’sunerek’).

In **Azerbaijani** eighty-three is **səksən üç**.

In **Basque** eighty-three is **laurogeita hiru**.

In **Belarusian** eighty-three is **восемдзесят тры** (vosiemdziesiat try).

In **Bengali** eighty-three is **তিরাশি** (tirāśi).

In **Bosnian** eighty-three is **osamdeset i tri**.

In **Bulgarian** eighty-three is **осемдесет и три** (osemdeset i tri).

In **Catalan** eighty-three is **vuitanta-tres**.

In **Cebuano** eighty-three is **kawaloan ug tulo ka**.

In **Cherokee** eighty-three is **ᏧᏁᎳᏍᎪ ᏦᎢ** (tsunelasgo tsoi). More info.

In **Chichewa** eighty-three is **eyite atatu**.

In **Chinese (Simplified)** eighty-three is **八十三** (bāshísān).

In **Chinese (Traditional)** eighty-three is **八十三** (bāshísān).

In **Corsican** eighty-three is **ottanta-di trè**.

In **Croatian** eighty-three is **osamdeset tri**.

In **Czech ** eighty-three is **osmdesát tři**.

In **Danish** eighty-three is **treogfirs**.

In **Dutch** eighty-three is **drieëntachtig**.

In **Esperanto** eighty-three is **okdek tri**.

In **Estonian** eighty-three is **kaheksakümmend kolm**.

In **Filipino** eighty-three is **may walong pu’t tatlong**.

In **Finnish** eighty-three is **kahdeksankymmentäkolme**.

In **French** eighty-three is **quatre vingt trois**.

In **Frisian** eighty-three is **trijentachtich**.

In **Galician** eighty-three is **oitenta e tres**.

In **Georgian** eighty-three is **ოთხმოცდასამი** (ot’khmots’dasami).

In **German** eighty-three is **dreiundachtzig**.

In **Greek** eighty-three is **ογδόντα τρία** (ogdónta tría).

In **Gujarati** eighty-three is **એંસી ત્રણ** (ēnsī traṇa).

In **Haitian Creole** eighty-three is **katreven-twa**.

In **Hausa** eighty-three is **tamanin da uku**.

In **Hawaiian** eighty-three is **kanawalu-ekolu**.

In **Hebrew** eighty-three is **שמונים ושלוש** (_____).

In **Hindi** eighty-three is **तिरासी** (tiraasee).

In **Hmong** eighty-three is **eighty-peb**.

In **Hungarian** eighty-three is **nyolcvanhárom**.

In **Icelandic** eighty-three is **áttatíu og þrír**. More info.

In **Igbo** eighty-three is **iri-na-atọ**.

In **Indonesian** eighty-three is **delapan puluh tiga**.

In **Irish** eighty-three is **ochtó is trí**.

In **Italian** eighty-three is **ottantatre**.

In **Japanese** eighty-three is **八十三** (yasomi).

In **Javanese** eighty-three is **wolung puluh telu**.

In **Kannada** eighty-three is **ಎಂಬತ್ಮೂರು** (embatmūru).

In **Kazakh** eighty-three is **сексен үш** (seksen üş).

In **Khmer** eighty-three is **ប៉ែតសិបបី** (betseb bei).

In **Korean** eighty-three is **여든세** (yeodeunse).

In **Kurdish (Kurmanji)** eighty-three is **heştê-sê**.

In **Kyrgyz** eighty-three is **сексен үч** (seksen üç).

In **Lao** eighty-three is **eighty ສາມ** (eighty sam).

In **Latin** eighty-three is **octoginta trium**.

In **Latvian** eighty-three is **astoņdesmit trīs**.

In **Lithuanian** eighty-three is **aštuoniasdešimt trys**.

In **Luxembourgish** eighty-three is **uechtzeg-dräi**.

In **Macedonian** eighty-three is **осумдесет и три** (osumdeset i tri).

In **Malagasy** eighty-three is **amby valo-telo**.

In **Malay** eighty-three is **lapan puluh tiga**.

In **Malayalam** eighty-three is **എണ്പത്തിമൂന്ന്** (eṇpattimūnn).

In **Maltese** eighty-three is **tlieta u tmenien** (tlieta “three” *u* “and” tmenien “eighty”). More info.

In **Maori** eighty-three is **e waru tekau-toru**.

In **Marathi** eighty-three is **त्र्याऐंशी** (tryā’ainśī).

In **Mongolian** eighty-three is **наян гурав** (nayan gurav)

In **Myanmar (Burmese)** eighty-three is **ရှစ်ဆယ့်သုံး** (shit s y sone).

In **Navajo** eighty-three is **tseebídiin dóó ba’ąą táá’** (*tseebídiin* “eighty” *dóó ba’ąą* “and in addition to it” *táá’* “three”). More info.

In **Nepali** eighty-three is **असी तीन** (asī tīna).

In **Norwegian** eighty-three is **åttitre**.

In **Pashto** eighty-three is **اتيا درې** (_____).

In **Persian** eighty-three is **هشتاد و سه** (_____).

In **Polish** eighty-three is **osiemdziesiąt trzy**.

In **Portuguese** eighty-three is **oitenta e três**.

In **Punjabi** eighty-three is **ਅੱਸੀ-ਤਿੰਨ** (asī-tina).

In **Romanian** eighty-three is **optzeci și trei**.

In **Russian** eighty-three is **восемьдесят три** (vosem’desyat tri).

In **Samoan** eighty-three is **valusefulu-tolu**.

In **Scots Gaelic** eighty-three is **ceithir fichead ’sa trì**.

In **Serbian** eighty-three is **осамдесет три** (osamdeset tri).

In **Sesotho** eighty-three is **mashome a robeli e meraro**.

In **Shona** eighty-three is **makumi masere nematatu**.

In **Sindhi** eighty-three is **اسي-ٽي** (_____).

In **Sinhala** eighty-three is **අසු තුන** (asu tuna).

In **Slovak** eighty-three is **osemdesiat tri**.

In **Slovenian** eighty-three is **tri in osemdeset**.

In **Somali** eighty-three is **siddeetan iyo saddex**.

In **Spanish** eighty-three is **ochenta y tres** (*ochenta* “eighty” *y* “and” *tres* “three”).

In **Sundanese** eighty-three is **dalapan puluh tilu**.

In **Swahili** eighty-three is **themanini na mitatu**.

In **Swedish** eighty-three is **_____**.

In **Tajik** eighty-three is **ҳаштоду се** (_____).

In **Tamil** eighty-three is **எண்பத்தி மூன்று** (eṇpatti mūṉṟu).

In **Telugu** eighty-three is **ఎనభై మూడు** (enabhai mūḍu).

In **Thai** eighty-three is **แปดสิบสาม** (pæd s̄ib s̄ām).

In **Turkish** eighty-three is **seksen üç**.

In **Ukrainian** eighty-three is **вісімдесят три** (visimdesyat try).

In **Urdu** eighty-three is **تراسی** (_____).

In **Uzbek** eighty-three is **sakson uch**.

In **Vietnamese** eighty-three is **tám mươi ba**.

In **Welsh** eighty-three is **wyth deg tri o**.

In **Xhosa** eighty-three is **asibhozo anesithathu**.

In **Yiddish** eighty-three is **_____** (_____). (אַכציק “eighty” דרײַ “three”). More info.

In **Yoruba** eighty-three is **ọgọrin-mẹta**.

In **Zulu** eighty-three is **ayisishiyagalombili nantathu**.