Table des bases

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Introduction

Cet article contient une table de bases.

Note : Ce qui suit s'applique seulement pour les systèmes à notation positionnelle.

Passage d'une base à une autre

En Occident, la plupart des gens ont appris à compter en base 10 avec les chiffres 0, 1, 2..., 9. Cependant, il existe d'autres systèmes de numération, les plus connus étant les systèmes binaire (0, 1) et hexadécimal (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F).

Du système décimal à un autre système

Il existe un algorithme qui permet de passer du système décimal à un autre.

1. Faire la [division](/fr/definitions/division)[type=embedded-definition] entière du [nombre](/fr/definitions/nombre)[type=embedded-definition] N par 10, noter le reste R

2. Si le dividende D vaut [zéro](/fr/definitions/zero)[type=embedded-definition], aller à l'étape 5.

`3. Le dividende D devient le nombre N.`

4. Aller à l'étape 1.

5. La suite des restes R, du dernier au premier, sont les chiffres du nombre recherché.

Supposons que l'on souhaite convertir le nombre 100010 en base 16. Il suffit d'appliquer l'algorithme.

1000 ÷ 16 = 62 reste 8

62 ÷ 16 = 3 reste 14

3 ÷ 16 = 0 reste 3

Donc, 100010 = {3, 14, 8}16 = 3E816.

D'un autre système au système décimal

Pour passer d'un autre système au système décimal, il faut se rappeler une propriété de la notation positionnelle : chaque chiffre est équivalent à chiffre * (base). Par exemple, 45710 est équivalent à 4 * 10² + 5 * 10 + 7 * 10, étant entendu que la première position à la droite vaut zéro, la suivante vers la gauche vaut 1, et ainsi de suite.

Pour convertir 3E816 en base 10, il faut calculer 3 * 16² + E * 16 + 8 * 16 = 768 + 14 * 16 + 8 * 1 = 1000~10~, qui est la réponse attendue.

Table

Cette table donne les valeurs de 1 à 100 dans les bases de 2 à 20.

BaseBaseBaseBase
n23456n7891011n1213141516n17181920
11213141516n=1171819110111n=1112113114115116n=1117118119120
210223242526n=2272829210211n=2212213214215216n=2217218219220
3112103343536n=3373839310311n=3312313314315316n=3317318319320
410021131044546n=4474849410411n=4412413414415416n=4417418419420
5101212311410556n=5575859510511n=5512513514515516n=5517518519520
61102203124115106n=6676869610611n=6612613614615616n=6617618619620
71112213134125116n=71077879710711n=7712713714715716n=7717718719720
810002223204135126n=811710889810811n=8812813814815816n=8817818819820
9100121003214145136n=9127118109910911n=9912913914915916n=9917918919920
10101021013224205146n=101371281191010a11n=10a12a13a14a15a16n=10a17a18a19a20
11101121023234215156n=1114713812911101011n=11b12b13b14b15b16n=11b17b18b19b20
12110021103304225206n=1215714813912101111n=121012c13c14c15c16n=12c17c18c19c20
13110121113314235216n=1316715814913101211n=1311121013d14d15d16n=13d17d18d19d20
14111021123324245226n=1420716815914101311n=14121211131014e15e16n=14e17e18e19e20
15111121203334305236n=1521717816915101411n=151312121311141015f16n=15f17f18f19f20
1610000212131004315246n=1622720817916101511n=1614121313121411151016n=16g17g18g19g20
1710001212231014325256n=1723721818917101611n=1715121413131412151116n=171017h18h19h20
1810010220031024335306n=1824722820918101711n=1816121513141413151216n=1811171018i19i20
1910011220131034345316n=1925723821919101811n=1917121613151414151316n=19121711181019j20
2010100220231104405326n=2026724822920101911n=2018121713161415151416n=201317121811191020
2110101221031114415336n=2130725823921101a11n=2119121813171416151516n=211417131812191120
2210110221131124425346n=2231726824922102011n=221a121913181417151616n=221517141813191220
2310111221231134435356n=2332727825923102111n=231b121a13191418151716n=231617151814191320
2411000222031204445406n=2433730826924102211n=2420121b131a1419151816n=241717161815191420
25110012221312141005416n=2534731827925102311n=2521121c131b141a151916n=251817171816191520
26110102222312241015426n=2635732828926102411n=26221220131c141b151a16n=261917181817191620
271101121000312341025436n=2736733830927102511n=27231221131d141c151b16n=271a17191818191720
281110021001313041035446n=2840734831928102611n=282412221320141d151c16n=281b171a1819191820
291110121002313141045456n=2941735832929102711n=292512231321141e151d16n=291c171b181a191920
301111021010313241105506n=3042736833930102811n=3026122413221420151e16n=301d171c181b191a20
311111121011313341115516n=3143737834931102911n=3127122513231421151f16n=311e171d181c191b20
3210000021012320041125526n=3244740835932102a11n=3228122613241422152016n=321f171e181d191c20
3310000121020320141135536n=3345741836933103011n=3329122713251423152116n=331g171f181e191d20
3410001021021320241145546n=3446742837934103111n=342a122813261424152216n=3420171g181f191e20
3510001121022320341205556n=3550743838935103211n=352b122913271425152316n=3521171h181g191f20
36100100211003210412151006n=3651744840936103311n=3630122a13281426152416n=36221720181h191g20
37100101211013211412251016n=3752745841937103411n=3731122b13291427152516n=37231721181i191h20
38100110211023212412351026n=3853746842938103511n=3832122c132a1428152616n=382417221820191i20
39100111211103213412451036n=3954747843939103611n=39331230132b1429152716n=392517231821191j20
40101000211113220413051046n=4055750844940103711n=40341231132c142a152816n=402617241822192020
41101001211123221413151056n=4156751845941103811n=41351232132d142b152916n=412717251823192120
42101010211203222413251106n=4260752846942103911n=423612331330142c152a16n=422817261824192220
43101011211213223413351116n=4361753847943103a11n=433712341331142d152b16n=432917271825192320
44101100211223230413451126n=4462754848944104011n=443812351332142e152c16n=442a17281826192420
45101101212003231414051136n=4563755850945104111n=4539123613331430152d16n=452b17291827192520
46101110212013232414151146n=4664756851946104211n=463a123713341431152e16n=462c172a1828192620
47101111212023233414251156n=4765757852947104311n=473b123813351432152f16n=472d172b1829192720
48110000212103300414351206n=4866760853948104411n=4840123913361433153016n=482e172c182a192820
49110001212113301414451216n=49100761854949104511n=4941123a13371434153116n=492f172d182b192920
50110010212123302420051226n=50101762855950104611n=5042123b13381435153216n=502g172e182c192a20
51110011212203303420151236n=51102763856951104711n=5143123c13391436153316n=5130172f182d192b20
52110100212213310420251246n=52103764857952104811n=52441240133a1437153416n=5231172g182e192c20
53110101212223311420351256n=53104765858953104911n=53451241133b1438153516n=5332172h182f192d20
54110110220003312420451306n=54105766860954104a11n=54461242133c1439153616n=54331730182g192e20
55110111220013313421051316n=55106767861955105011n=55471243133d143a153716n=55341731182h192f20
56111000220023320421151326n=56110770862956105111n=564812441340143b153816n=56351732182i192g20
57111001220103321421251336n=57111771863957105211n=574912451341143c153916n=573617331830192h20
58111010220113322421351346n=58112772864958105311n=584a12461342143d153a16n=583717341831192i20
59111011220123323421451356n=59113773865959105411n=594b12471343143e153b16n=593817351832192j20
60111100220203330422051406n=60114774866960105511n=6050124813441440153c16n=603917361833193020
61111101220213331422151416n=61115775867961105611n=6151124913451441153d16n=613a17371834193120
62111110220223332422251426n=62116776868962105711n=6252124a13461442153e16n=623b17381835193220
63111111221003333422351436n=63120777870963105811n=6353124b13471443153f16n=633c17391836193320
6410000002210131000422451446n=641217100871964105911n=6454124c13481444154016n=643d173a1837193420
6510000012210231001423051456n=651227101872965105a11n=6555125013491445154116n=653e173b1838193520
6610000102211031002423151506n=661237102873966106011n=66561251134a1446154216n=663f173c1839193620
6710000112211131003423251516n=671247103874967106111n=67571252134b1447154316n=673g173d183a193720
6810001002211231010423351526n=681257104875968106211n=68581253134c1448154416n=6840173e183b193820
6910001012212031011423451536n=691267105876969106311n=69591254134d1449154516n=6941173f183c193920
7010001102212131012424051546n=701307106877970106411n=705a12551350144a154616n=7042173g183d193a20
7110001112212231013424151556n=711317107878971106511n=715b12561351144b154716n=7143173h183e193b20
7210010002220031020424252006n=721327110880972106611n=726012571352144c154816n=72441740183f193c20
7310010012220131021424352016n=731337111881973106711n=736112581353144d154916n=73451741183g193d20
7410010102220231022424452026n=741347112882974106811n=746212591354144e154a16n=74461742183h193e20
7510010112221031023430052036n=751357113883975106911n=7563125a13551450154b16n=75471743183i193f20
7610011002221131030430152046n=761367114884976106a11n=7664125b13561451154c16n=764817441840193g20
7710011012221231031430252056n=771407115885977107011n=7765125c13571452154d16n=774917451841193h20
7810011102222031032430352106n=781417116886978107111n=7866126013581453154e16n=784a17461842193i20
7910011112222131033430452116n=791427117887979107211n=7967126113591454154f16n=794b17471843193j20
8010100002222231100431052126n=801437120888980107311n=80681262135a1455155016n=804c17481844194020
81101000121000031101431152136n=8114471218100981107411n=81691263135b1456155116n=814d17491845194120
82101001021000131102431252146n=8214571228101982107511n=826a1264135c1457155216n=824e174a1846194220
83101001121000231103431352156n=8314671238102983107611n=836b1265135d1458155316n=834f174b1847194320
84101010021001031110431452206n=8415071248103984107711n=8470126613601459155416n=844g174c1848194420
85101010121001131111432052216n=8515171258104985107811n=857112671361145a155516n=8550174d1849194520
86101011021001231112432152226n=8615271268105986107911n=867212681362145b155616n=8651174e184a194620
87101011121002031113432252236n=8715371278106987107a11n=877312691363145c155716n=8752174f184b194720
88101100021002131120432352246n=8815471308107988108011n=8874126a1364145d155816n=8853174g184c194820
89101100121002231121432452256n=8915571318108989108111n=8975126b1365145e155916n=8954174h184d194920
90101101021010031122433052306n=9015671328110990108211n=9076126c13661460155a16n=90551750184e194a20
91101101121010131123433152316n=9116071338111991108311n=9177127013671461155b16n=91561751184f194b20
92101110021010231130433252326n=9216171348112992108411n=9278127113681462155c16n=92571752184g194c20
93101110121011031131433352336n=9316271358113993108511n=9379127213691463155d16n=93581753184h194d20
94101111021011131132433452346n=9416371368114994108611n=947a1273136a1464155e16n=94591754184i194e20
95101111121011231133434052356n=9516471378115995108711n=957b1274136b1465155f16n=955a17551850194f20
96110000021012031200434152406n=9616571408116996108811n=96801275136c1466156016n=965b17561851194g20
97110000121012131201434252416n=9716671418117997108911n=97811276136d1467156116n=975c17571852194h20
98110001021012231202434352426n=9820071428118998108a11n=9882127713701468156216n=985d17581853194i20
99110001121020031203434452436n=9920171438120999109011n=9983127813711469156316n=995e17591854194j20
100110010021020131210440052446n=100202714481219100109111n=1008412791372146a156416n=1005f175a1855195020