39 (număr)

Pentru anul 39 al erei noastre, vedeți 39.
← 38 39 40 →
Cardinaltreizeci și nouă
Ordinal39-lea
treizeci și nouălea
Factorizare1, 3, 13, 39
Cifre romaneXXXIX
Binar1001112
Ternar11103
Cuaternar2134
Cvinariu1245
Senar1036
Octal478
Duodecimal3312
Hexazecimal2716
Vigesimal1J20
Baza 361336
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39 (treizeci și nouă) este numărul natural care urmează după 38 și este urmat de 40.

În matematică

  • 39 este suma unor numere prime consecutive (39 = 3 + 5 + 7 + 11 + 13) și este de asemenea produsul dintre primul și ultimul termen al acestui șir de numere (39 = 3 x 13). Este un număr semiprim,[1][2] iar dintre numerele semiprime, doar 3 alte numere mai prezintă această proprietate descrisă (10, 155 și 371).
  • Este suma primelor trei puteri ale lui 3 (39 = 31 + 32 + 33). Funcția Mertens pentru 39 ia valoarea 0.[3]
  • Este un număr Perrin.[4]
  • Este un număr Størmer.[5][6]

În știință

Astronomie

În cultura populară

Note

  1. ^ Coman, Enciclopedia…, p. 78
  2. ^ Șirul A001358 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
  3. ^ „Sloane's A028442 : Numbers n such that Mertens' function is zero”. Enciclopedia electronică a șirurilor de numere întregi. OEIS Foundation. Accesat în . 
  4. ^ Șirul A001608 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
  5. ^ Coman, Enciclopedia…, p. 83
  6. ^ Șirul A005528 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
  7. ^ Meija, Juris; Coplen, Tyler B.; Berglund, Michael; Brand, Willi A.; Bièvre, Paul De; Gröning, Manfred; Holden, Norman E.; Irrgeher, Johanna; Loss, Robert D.; Walczyk, Thomas; Prohaska, Thomas (). „Atomic weights of the elements 2013 (IUPAC Technical Report)”. Pure and Applied Chemistry (în engleză). 88 (3): 345–341. doi:10.1515/pac-2015-0305. ISSN 0033-4545. 

Bibliografie

  • Marius Coman, Enciclopedia matematică a claselor de numere întregi, Columbus, Ohio: Education Publishing, 2013, ISBN: 978-1-59973-239-4

Legături externe

Materiale media legate de 39 la Wikimedia Commons

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