Nombre 291

Infotaula nombreNombre 291
Tipusnombre natural, nombre senar, icosihenagonal number (en) Tradueix i nombre compost Modifica el valor a Wikidata
Propietats
Valor291 Modifica el valor a Wikidata
Factorització3 x 97
Altres numeracions
Numeral romàCCXCI
Binari1001000112
Hexadecimal12316

El nombre 291 (CCXCI, Doscents noranta-u) és el nombre natural que segueix el nombre 290 i precedeix el nombre 292. La seva representació binària és 100100011, la representació octal 443 i l'hexadecimal 123. La seva factorització en nombres primers és 3 × 97 = 291.

Ocurrències matemàtiques

  • Aquest nombre té quatre divisors: 1, 3, 97 i 291. La suma del seus divisors, sense incloure 291, és menor al seu valor, per aquest motiu, se'l considera un nombre deficient.
  • Hi és a cinc ternes pitagòriques: (195, 216, 291), (291, 388, 485), (291, 4700, 4709), (291, 14112, 14115), (291, 42340, 42341).
  • És la suma del 52è nombre primer (239) i 52, ja que forma part de la sèrie .[2]
  • És el primer dels nombres avorrits, sent així el desencadenant de la paradoxa dels nombres avorrits de la Wikipèdia.

En altres dominis

Referències

  1. ↑ [enllaç sense format] https://oeis.org/A003273
  2. ↑ [enllaç sense format] https://oeis.org/A014688

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