43 (szám)

Ez a szócikk a negyvenhármas számról szól. A 43. évről szóló cikket lásd itt: 43.
43
(negyvenhárom)
… 39 40 41 42 « 43 » 44 45 46 47 …
… 10 20 30 40 • 50 60 70 80 …
… 0 • 100 200 300 400 …
Tulajdonságok
Normálalak4,3 · 101
Kanonikus alakprímszám
Osztók1, 43
Római számmalXLIII
Számrendszerek
Bináris alak1010112
Oktális alak538
Hexadecimális alak2B16
Számelméleti függvények értékei
Euler-függvény42
Möbius-függvény−1
Mertens-függvény−3
Osztók száma2
Osztók összege44
hiányos szám
Valódiosztó-összeg0

A 43 (negyvenhárom) a 42 és 44 között található természetes szám.

A szám a matematikában

A tízes számrendszerbeli 43-as a kettes számrendszerben 101011, a nyolcas számrendszerben 53, a tizenhatos számrendszerben 2B alakban írható fel.

A 43 páratlan szám, prímszám. Kanonikus alakja 43, normálalakban a 4,3 · 101 szorzattal írható fel. Két osztója van a természetes számok halmazán, ezek növekvő sorrendben: 1 és 43.

A 41 ikerprím-párja.

A legkisebb prím, ami nem Chen-prím.

Wagstaff-prím – (2ⁿ+1)/3 alakú prím, ahol n prímszám.

A Sylvester-sorozat tagja.

Középpontos hétszögszám.

6-os számrendszerben repunit (111).

Öt szám valódiosztó-összegeként áll elő, ezek az 50, 185, 341, 377 és a 437.[1][2]

A tudományban

Jegyzetek

Commons:Category:43 (number)
A Wikimédia Commons tartalmaz 43 (szám) témájú médiaállományokat.

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