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Vzvišeno število

Vzvíšeno števílo je v matematiki pozitivno celo število, katerega število pozitivnih deliteljev (vključno s številom samim) je popolno število in katerih vsota je spet popolno število (funkciji d(n) in σ(n) sta neki popolni števili).[1]

Število 12 je na primer vzvišeno. Število njegovih pozitivnih deliteljev (6) je popolno število: 1, 2, 3, 4, 6 in 12; njihova vsota pa je spet popolno število: 1+2+3+4+6+12 = 28.

Znani sta le dve takšni števili (OEIS A081357)[2]:215:

in

Število pozitivnih deliteljev drugega števila je M727-1 = (27-1) 26 = (126 + 1) 26 = 8128 (četrto popolno število), vsota deliteljev pa je M1272127-1 = (2126+1-1) 261+31+19+7+5+3 = (2127-1) 2126 (dvanajsto popolno število).

Opombe in sklici

[uredi | uredi kodo]
  1. Članek na MathPages (angleško)
  2. Pickover (2003), str. 215
  • Pickover, Clifford Alan (2003). Wonders of Numbers, Adventures in Mathematics, Mind and Meaning. New York: Oxford University Press.
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