tables > repunit > 21

Base 21 Repunits

Table

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(available: 0-999)

Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>

0: \[{21^{0}-1\over20}\] 0
1: \[{21^{1}-1\over20}\] 1
2: \[{21^{2}-1\over20}\] 2 × 11
3: \[{21^{3}-1\over20}\] 463
4: \[{21^{4}-1\over20}\] 22 × 11 × 13 × 17
5: \[{21^{5}-1\over20}\] 5 × 40841
6: \[{21^{6}-1\over20}\] 2 × 11 × 421 × 463
7: \[{21^{7}-1\over20}\] 43 × 631 × 3319
8: \[{21^{8}-1\over20}\] 23 × 11 × 13 × 17 × 97241
9: \[{21^{9}-1\over20}\] 463 × 85775383
10: \[{21^{10}-1\over20}\] 2 × 5 × 11 × 40841 × 185641
11: \[{21^{11}-1\over20}\] 17513875027111<14>
12: \[{21^{12}-1\over20}\] 22 × 11 × 13 × 17 × 61 × 421 × 463 × 3181
13: \[{21^{13}-1\over20}\] 79 × 189437 × 516094151
14: \[{21^{14}-1\over20}\] 2 × 11 × 43 × 631 × 3319 × 81867661
15: \[{21^{15}-1\over20}\] 5 × 211 × 463 × 9391 × 18181 × 40841
16: \[{21^{16}-1\over20}\] 24 × 11 × 13 × 17 × 62897 × 97241 × 300673
17: \[{21^{17}-1\over20}\] 1502097124754084594737<22>
18: \[{21^{18}-1\over20}\] 2 × 11 × 19 × 37 × 199 × 421 × 463 × 613 × 85775383
19: \[{21^{19}-1\over20}\] 12061389013<11> × 54921106624003<14>
20: \[{21^{20}-1\over20}\] 22 × 5 × 11 × 13 × 17 × 41 × 40841 × 185641 × 920421641
21: \[{21^{21}-1\over20}\] 43 × 463 × 631 × 3319 × 4789 × 6427 × 227633407
22: \[{21^{22}-1\over20}\] 2 × 112 × 23 × 6073 × 10362529 × 17513875027111<14>
23: \[{21^{23}-1\over20}\] 47 × 19597 × 139870566115103282847737<24>
24: \[{21^{24}-1\over20}\] 23 × 11 × 13 × 17 × 61 × 73 × 421 × 463 × 3181 × 97241 × 518118697
25: \[{21^{25}-1\over20}\] 52 × 40841 × 2031851 × 27385718497004633851<20>
26: \[{21^{26}-1\over20}\] 2 × 11 × 79 × 189437 × 516094151 × 7021471715414521<16>
27: \[{21^{27}-1\over20}\] 109 × 163 × 463 × 4779433 × 85775383 × 7429452749713<13>
28: \[{21^{28}-1\over20}\] 22 × 11 × 13 × 17 × 29 × 43 × 631 × 3319 × 3697 × 81867661 × 68454248717<11>
29: \[{21^{29}-1\over20}\] 59 × 1103704099 × 246763300513<12> × 687613372491653<15>
30: \[{21^{30}-1\over20}\] 2 × 5 × 11 × 31 × 211 × 421 × 463 × 2551 × 9391 × 18181 × 40841 × 185641 × 501001
31: \[{21^{31}-1\over20}\] 4540713283<10> × 3936833990413<13> × 272581865551637989<18>
32: \[{21^{32}-1\over20}\] 25 × 11 × 13 × 17 × 1217 × 2689 × 31873 × 62897 × 97241 × 300673 × 6857635489<10>
33: \[{21^{33}-1\over20}\] 67 × 463 × 17513875027111<14> × 3955202198062795629622003<25>
34: \[{21^{34}-1\over20}\] 2 × 11 × 11969 × 114089969144083169<18> × 1502097124754084594737<22>
35: \[{21^{35}-1\over20}\] 5 × 43 × 631 × 1471 × 3319 × 40841 × 4149601 × 20028751 × 421503321597121<15>
36: \[{21^{36}-1\over20}\] 22 × 11 × 13 × 17 × 19 × 37 × 61 × 199 × 421 × 463 × 613 × 1693 × 3181 × 85775383 × 4344847859197<13>
37: \[{21^{37}-1\over20}\] 31081 × 1681762703 × 7995105693353508392600118377453099<34>
38: \[{21^{38}-1\over20}\] 2 × 11 × 609673 × 12061389013<11> × 54921106624003<14> × 987749814642143197<18>
39: \[{21^{39}-1\over20}\] 79 × 463 × 547 × 1171 × 189437 × 516094151 × 80459337199345300130638393<26>
40: \[{21^{40}-1\over20}\] 23 × 5 × 11 × 13 × 17 × 41 × 40841 × 97241 × 185641 × 3441241 × 920421641 × 415710882920521<15>
41: \[{21^{41}-1\over20}\] 83 × 14122861 × 83218931 × 17222085343<11> × 914531249431<12> × 52899783148909<14>
42: \[{21^{42}-1\over20}\] 2 × 11 × 43 × 337 × 421 × 463 × 631 × 3319 × 4789 × 6427 × 81867661 × 227633407 × 22864311556633<14>
43: \[{21^{43}-1\over20}\] 35842614220783025524408588074144786493150233831596714503<56>
44: \[{21^{44}-1\over20}\] 22 × 112 × 13 × 17 × 23 × 89 × 661 × 6073 × 10362529 × 17513875027111<14> × 4718573764413203147069<22>
45: \[{21^{45}-1\over20}\] 5 × 211 × 463 × 9391 × 18181 × 40841 × 41489011 × 57815101 × 85775383 × 22554946693833031<17>
46: \[{21^{46}-1\over20}\] 2 × 11 × 47 × 277 × 461 × 599 × 691 × 19597 × 2215825387044753577<19> × 139870566115103282847737<24>
47: \[{21^{47}-1\over20}\] 49727 × 227011 × 75042551 × 158545759 × 5298873343<10> × 9794718038248648833094153<25>
48: \[{21^{48}-1\over20}\] 24 × 11 × 13 × 17 × 61 × 73 × 193 × 421 × 433 × 463 × 673 × 3181 × 62897 × 97241 × 300673 × 1001713 × 25392481 × 518118697
49: \[{21^{49}-1\over20}\] 43 × 631 × 3319 × 7057 × 1606344741163<13> × 1767442850839<13> × 1703751007820049542146461103<28>
50: \[{21^{50}-1\over20}\] 2 × 52 × 11 × 101 × 40841 × 185641 × 2031851 × 11093851 × 248303068144516751<18> × 27385718497004633851<20>
51: \[{21^{51}-1\over20}\] 463 × 38047 × 1502097124754084594737<22> × 51233569124705721849500009982296618143<38>
52: \[{21^{52}-1\over20}\] 22 × 11 × 132 × 17 × 53 × 79 × 32969 × 101089 × 189437 × 516094151 × 7021471715414521<16> × 23509884574335185209<20>
53: \[{21^{53}-1\over20}\] 1697 × 207612155793974069<18> × 372515213872960388437<21> × 4555268603071594349347155493<28>
54: \[{21^{54}-1\over20}\] 2 × 11 × 19 × 37 × 109 × 163 × 199 × 421 × 463 × 613 × 5077 × 17497 × 4779433 × 85775383 × 7429452749713<13> × 7101932659132249<16>
55: \[{21^{55}-1\over20}\] 5 × 881 × 40841 × 5664205361<10> × 17513875027111<14> × 270573999780463721<18> × 54598616218616435702441<23>
56: \[{21^{56}-1\over20}\] 23 × 11 × 13 × 17 × 29 × 43 × 617 × 631 × 3319 × 3697 × 97241 × 912521 × 81867661 × 68454248717<11> × 115593326297<12> × 831380909129<12>
57: \[{21^{57}-1\over20}\] 463 × 304609 × 12061389013<11> × 54921106624003<14> × 1244541772187848099210936765314595053007129<43>
58: \[{21^{58}-1\over20}\] 2 × 11 × 59 × 1277 × 1103704099 × 246763300513<12> × 687613372491653<15> × 7865855595529911658005355038639053<34>
59: \[{21^{59}-1\over20}\] 896447 × 334217419 × 47540111129611360301<20> × 3599933694931243085497791696053868938364103<43>
60: \[{21^{60}-1\over20}\] 22 × 5 × 11 × 13 × 17 × 31 × 41 × 61 × 211 × 421 × 463 × 2551 × 3181 × 9391 × 18181 × 40841 × 185641 × 501001 × 1360861 × 920421641 × 1053606939618901<16>
61: \[{21^{61}-1\over20}\] 15373 × 12519763 × 1128331159687<13> × 1814065850324073713<19> × 57398774322642953389748085156004642469<38>
62: \[{21^{62}-1\over20}\] 2 × 11 × 78059 × 4540713283<10> × 3936833990413<13> × 272581865551637989<18> × 56748249908554278937564172324714039<35>
63: \[{21^{63}-1\over20}\] 43 × 127 × 463 × 631 × 3319 × 4789 × 6427 × 51787 × 85775383 × 227633407 × 22125429901<11> × 27186384126763<14> × 100595851688887003<18>
64: \[{21^{64}-1\over20}\] 26 × 11 × 13 × 17 × 1217 × 2689 × 31873 × 62897 × 97241 × 300673 × 6857635489<10> × 1023263388750334684164671319051311082339521<43>
65: \[{21^{65}-1\over20}\] 5 × 79 × 131 × 40841 × 189437 × 443431 × 516094151 × 47999819885150422820855221255204479443163906801765079421<56>
66: \[{21^{66}-1\over20}\] 2 × 112 × 23 × 67 × 421 × 463 × 3499 × 6073 × 28513 × 33199 × 10362529 × 17513875027111<14> × 87989435079877<14> × 3955202198062795629622003<25>
67: \[{21^{67}-1\over20}\] 269 × 324363426169571<15> × 312929837239650768379490219650039<33> × 71028332352256443443129296219339913167<38>
68: \[{21^{68}-1\over20}\] 22 × 11 × 13 × 172 × 11969 × 300293033 × 114089969144083169<18> × 1502097124754084594737<22> × 399981195234791390040813065378761<33>
69: \[{21^{69}-1\over20}\] 47 × 463 × 19597 × 459878292118921111<18> × 139870566115103282847737<24> × 31179105887601949149105715319437017328831<41>
70: \[{21^{70}-1\over20}\] 2 × 5 × 11 × 43 × 71 × 631 × 1471 × 3319 × 40841 × 140351 × 185641 × 4149601 × 20028751 × 78555121 × 81867661 × 421503321597121<15> × 72413241922093801<17>
71: \[{21^{71}-1\over20}\] 493509073 × 6912925952086714539251625713<28> × 110556144297525239244017467747224789359885811468762753179<57>
72: \[{21^{72}-1\over20}\] 23 × 11 × 13 × 17 × 19 × 37 × 61 × 73 × 199 × 421 × 463 × 613 × 1693 × 3181 × 97241 × 816769 × 85775383 × 518118697 × 808208209 × 4344847859197<13> × 81967288802253121<17>
73: \[{21^{73}-1\over20}\] 30661 × 5424905842809814580790135175148153005273370039115139875248165723989059011789226683837426053<91>
74: \[{21^{74}-1\over20}\] 2 × 11 × 31081 × 1681762703 × 7995105693353508392600118377453099<34> × 379919184478057330357419845346252603881265273961<48>
75: \[{21^{75}-1\over20}\] 52 × 151 × 211 × 463 × 1051 × 1801 × 9391 × 18181 × 40841 × 2031851 × 9728219701<10> × 201307465501<12> × 27385718497004633851<20> × 138288178346489520230701<24>
76: \[{21^{76}-1\over20}\] 22 × 11 × 13 × 17 × 229 × 457 × 609673 × 12061389013<11> × 54921106624003<14> × 987749814642143197<18> × 3794540985952206860593938878074866571399837<43>
77: \[{21^{77}-1\over20}\] 43 × 631 × 3319 × 6225803431<10> × 17513875027111<14> × 39824892937303186001525100993399811<35> × 82721492925050166710438512180782661<35>
78: \[{21^{78}-1\over20}\] 2 × 11 × 79 × 421 × 463 × 547 × 1171 × 11701 × 189437 × 629773 × 516094151 × 7021471715414521<16> × 7691526674487958994017<22> × 80459337199345300130638393<26>
79: \[{21^{79}-1\over20}\] 2687 × 10903 × 15208288358346544216626697<26> × 122435283552586211204658864416622901<36> × 261513239159154440967606433092726647<36>
80: \[{21^{80}-1\over20}\] 24 × 5 × 11 × 13 × 17 × 41 × 241 × 9521 × 40841 × 62897 × 97241 × 185641 × 300673 × 3441241 × 22995281 × 33534961 × 920421641 × 3184193681 × 363230092241<12> × 415710882920521<15>
81: \[{21^{81}-1\over20}\] 109 × 163 × 463 × 4779433 × 85775383 × 7429452749713<13> × 251097226443098886970664441840231990201201851332912023687544574398706423<72>
82: \[{21^{82}-1\over20}\] 2 × 11 × 83 × 1231 × 1766117 × 14122861 × 83218931 × 17222085343<11> × 914531249431<12> × 52899783148909<14> × 33985282117517881270903492784746835442538163<44>
83: \[{21^{83}-1\over20}\] 167 × 756131 × 941221 × 23343519976297040387448341592997138604460338237413223529466429945751726176986579124533941307079<95>
84: \[{21^{84}-1\over20}\] 22 × 11 × 13 × 17 × 29 × 43 × 61 × 337 × 421 × 463 × 631 × 3181 × 3319 × 3697 × 4789 × 6427 × 18481 × 81867661 × 227633407 × 68454248717<11> × 22864311556633<14> × 2934413293238858072198024161<28>
85: \[{21^{85}-1\over20}\] 5 × 40841 × 1502097124754084594737<22> × 11500287881306297400572689205013166485061<41> × 346846213951614446714019035689488886491130381<45>
86: \[{21^{86}-1\over20}\] 2 × 11 × 173 × 15739 × 126851 × 169367548429<12> × 1163308526467<13> × 478811691676843729951<21> × 35842614220783025524408588074144786493150233831596714503<56>
87: \[{21^{87}-1\over20}\] 59 × 463 × 1103704099 × 246763300513<12> × 687613372491653<15> × 7826081384442721874824416529<28> × 13477015991023291802765110016390772920553907009<47>
88: \[{21^{88}-1\over20}\] 23 × 112 × 13 × 17 × 23 × 89 × 353 × 661 × 6073 × 97241 × 10362529 × 313433209 × 715521049 × 17513875027111<14> × 29831330140869137<17> × 32775913825604401<17> × 4718573764413203147069<22>
89: \[{21^{89}-1\over20}\] 138348511207<12> × 1719937817227174896868741057213630597485253956382680484361683645714455944660556942937263903929864448451087<106>
90: \[{21^{90}-1\over20}\] 2 × 5 × 11 × 19 × 31 × 37 × 199 × 211 × 421 × 463 × 613 × 2551 × 9391 × 18181 × 40841 × 185641 × 501001 × 658261 × 41489011 × 57815101 × 85775383 × 22554946693833031<17> × 82207575664095002495707981<26>
91: \[{21^{91}-1\over20}\] 43 × 79 × 631 × 3319 × 189437 × 516094151 × 35381269315942497678572657090020747<35> × 4264091474110761334946377629947327910839217826620223120485043<61>
92: \[{21^{92}-1\over20}\] 22 × 11 × 13 × 17 × 47 × 277 × 461 × 599 × 691 × 19597 × 477045301 × 11918195405621<14> × 2215825387044753577<19> × 139870566115103282847737<24> × 2641770975903509717963660601029203121<37>
93: \[{21^{93}-1\over20}\] 373 × 463 × 1303 × 4540713283<10> × 3936833990413<13> × 272581865551637989<18> × 5490236844314625181981860471139<31> × 7687249112242592598176964045333142849438561<43>
94: \[{21^{94}-1\over20}\] 2 × 11 × 283 × 1129 × 49727 × 227011 × 10165349 × 32036611 × 75042551 × 158545759 × 5298873343<10> × 230199028303<12> × 9794718038248648833094153<25> × 264564425522789761284612235919<30>
95: \[{21^{95}-1\over20}\] 5 × 40841 × 12061389013<11> × 19449969211<11> × 54921106624003<14> × 619598441951897251<18> × 2522688573446019221<19> × 4962575794097659196896553056277931780683391554141<49>
96: \[{21^{96}-1\over20}\] 25 × 11 × 13 × 17 × 61 × 73 × 97 × 193 × 421 × 433 × 463 × 673 × 1217 × 2689 × 3181 × 31873 × 62897 × 97241 × 300673 × 1001713 × 25392481 × 518118697 × 6857635489<10> × 93310250563834657<17> × 226108215051938888394049<24>
97: \[{21^{97}-1\over20}\] 1747 × 298027069 × 99141858256733<14> × 29748627560719740825024892426535732998061<41> × 5860963105358989903195525558207622859647715180010295355986863<61>
98: \[{21^{98}-1\over20}\] 2 × 11 × 43 × 631 × 3319 × 7057 × 81867661 × 1606344741163<13> × 1767442850839<13> × 2524084462789<13> × 86494371600108393937<20> × 156357474589352978545297<24> × 1703751007820049542146461103<28>
99: \[{21^{99}-1\over20}\] 67 × 463 × 85775383 × 17513875027111<14> × 782006960636353<15> × 146354764854514987<18> × 3955202198062795629622003<25> × 188145268678304791443009491673532813732054627291<48>

Index range: 0 – 99 next >>