33 (număr)

un număr compus.^[1]
un semiprim, fiind produsul a două numere prime: 33 = 3 x 11.^[2]^[3]
Este un număr Blum^[4]^[5] deoarece divizorii săi sunt numere prime gaussiene.
Este un număr Størmer.^[6]^[7]
un număr dodecagonal.^[8]^[9]
Este un număr centrat dodecaedric.^[10]
cel mai mare număr întreg pozitiv care nu poate fi exprimat ca suma unor numere triunghiulare diferite.
ce mai mic număr repdigit impar care nu este prim.
suma primelor patru factoriale pozitive: 33 = 1 + 2 + 6 + 24.
suma sumei divizorilor primelor 6 numere întregi pozitive.
suma a trei cuburi: $33=8866128975287528^{3}+(-8778405442862239)^{3}+(-2736111468807040)^{3}$ .^[11]

În știință

Este numărul atomic al arsenului.^[12]

Astronomie

NGC 33 este o stea dublă în constelația Peștii.
Messier 33 este o galaxie din constelația Triunghiul.
33 Polyhymnia este o planetă minoră.
33P/Daniel este o cometă periodică din sistemul solar.

Alte domenii

+33 este prefixul telefonic internațional al Franței.^[13]
Este codul de țară UIC al Chinei.^[14]

Note

^ Șirul A002808 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
^ Coman, Enciclopedia…, p. 78
^ Șirul A001358 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
^ Coman, Enciclopedia…, p. 17
^ Șirul A016105 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
^ Coman, Enciclopedia…, p. 83
^ Șirul A005528 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
^ Coman, Enciclopedia…, p. 64
^ Șirul A051624 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
^ Șirul A005904 la Enciclopedia electronică a șirurilor de numere întregi (OEIS)
^ Booker, Andrew R. (2019). „Cracking the problem with 33” (pdf). University of Bristol. arXiv:1903.04284 .
^ 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 (1 martie 2016). „Atomic weights of the elements 2013 (IUPAC Technical Report)”. Pure and Applied Chemistry (în engleză). 88 (3): 335–331. doi:10.1515/pac-2015-0305. ISSN 0033-4545.
^ „Telephone and Internet Country Codes in 10 Languages”. LincMad.
^ en Norma 920-14, versiunea 2 din martie 2005, uic.org

Bibliografie

Marius Coman, Enciclopedia matematică a claselor de numere întregi, Columbus, Ohio: Education Publishing, 2013, ISBN: 978-1-59973-237-4

Legături externe

Materiale media legate de 33 la Wikimedia Commons

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