The Number 83

By | March 14, 2016


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.


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 10100112.

83 in ternary (base 3) is 100023.

83 in quaternary (base 4) is 11034.

83 in quinary (base 5) is 3135.

83 in senary (base 6) is 2156.

83 in octal (base 8) is 1238.

83 in duodecimal (base 12) is 6B12.

83 in hexadecimal (base 16) is 5316.

83 in vigesimal (base 20) is 4320.

83 in base 36 is 2B36.


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 = e2πi/3)

that is irreducible (or equivalently prime) in the ring-theoretic sense: its only Eisenstein divisors are the units (±1, ±ω, ±ω2), 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 ប៉ែតសិប​បី (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.

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