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## G = D181order 362 = 2·181

### Dihedral group

Aliases: D181, C181⋊C2, sometimes denoted D362 or Dih181 or Dih362, SmallGroup(362,1)

Series: Derived Chief Lower central Upper central

 Derived series C1 — C181 — D181
 Chief series C1 — C181 — D181
 Lower central C181 — D181
 Upper central C1

Generators and relations for D181
G = < a,b | a181=b2=1, bab=a-1 >

181C2

Smallest permutation representation of D181
On 181 points: primitive
Generators in S181
```(1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181)
(1 181)(2 180)(3 179)(4 178)(5 177)(6 176)(7 175)(8 174)(9 173)(10 172)(11 171)(12 170)(13 169)(14 168)(15 167)(16 166)(17 165)(18 164)(19 163)(20 162)(21 161)(22 160)(23 159)(24 158)(25 157)(26 156)(27 155)(28 154)(29 153)(30 152)(31 151)(32 150)(33 149)(34 148)(35 147)(36 146)(37 145)(38 144)(39 143)(40 142)(41 141)(42 140)(43 139)(44 138)(45 137)(46 136)(47 135)(48 134)(49 133)(50 132)(51 131)(52 130)(53 129)(54 128)(55 127)(56 126)(57 125)(58 124)(59 123)(60 122)(61 121)(62 120)(63 119)(64 118)(65 117)(66 116)(67 115)(68 114)(69 113)(70 112)(71 111)(72 110)(73 109)(74 108)(75 107)(76 106)(77 105)(78 104)(79 103)(80 102)(81 101)(82 100)(83 99)(84 98)(85 97)(86 96)(87 95)(88 94)(89 93)(90 92)```

`G:=sub<Sym(181)| (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181), (1,181)(2,180)(3,179)(4,178)(5,177)(6,176)(7,175)(8,174)(9,173)(10,172)(11,171)(12,170)(13,169)(14,168)(15,167)(16,166)(17,165)(18,164)(19,163)(20,162)(21,161)(22,160)(23,159)(24,158)(25,157)(26,156)(27,155)(28,154)(29,153)(30,152)(31,151)(32,150)(33,149)(34,148)(35,147)(36,146)(37,145)(38,144)(39,143)(40,142)(41,141)(42,140)(43,139)(44,138)(45,137)(46,136)(47,135)(48,134)(49,133)(50,132)(51,131)(52,130)(53,129)(54,128)(55,127)(56,126)(57,125)(58,124)(59,123)(60,122)(61,121)(62,120)(63,119)(64,118)(65,117)(66,116)(67,115)(68,114)(69,113)(70,112)(71,111)(72,110)(73,109)(74,108)(75,107)(76,106)(77,105)(78,104)(79,103)(80,102)(81,101)(82,100)(83,99)(84,98)(85,97)(86,96)(87,95)(88,94)(89,93)(90,92)>;`

`G:=Group( (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181), (1,181)(2,180)(3,179)(4,178)(5,177)(6,176)(7,175)(8,174)(9,173)(10,172)(11,171)(12,170)(13,169)(14,168)(15,167)(16,166)(17,165)(18,164)(19,163)(20,162)(21,161)(22,160)(23,159)(24,158)(25,157)(26,156)(27,155)(28,154)(29,153)(30,152)(31,151)(32,150)(33,149)(34,148)(35,147)(36,146)(37,145)(38,144)(39,143)(40,142)(41,141)(42,140)(43,139)(44,138)(45,137)(46,136)(47,135)(48,134)(49,133)(50,132)(51,131)(52,130)(53,129)(54,128)(55,127)(56,126)(57,125)(58,124)(59,123)(60,122)(61,121)(62,120)(63,119)(64,118)(65,117)(66,116)(67,115)(68,114)(69,113)(70,112)(71,111)(72,110)(73,109)(74,108)(75,107)(76,106)(77,105)(78,104)(79,103)(80,102)(81,101)(82,100)(83,99)(84,98)(85,97)(86,96)(87,95)(88,94)(89,93)(90,92) );`

`G=PermutationGroup([[(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,180,181)], [(1,181),(2,180),(3,179),(4,178),(5,177),(6,176),(7,175),(8,174),(9,173),(10,172),(11,171),(12,170),(13,169),(14,168),(15,167),(16,166),(17,165),(18,164),(19,163),(20,162),(21,161),(22,160),(23,159),(24,158),(25,157),(26,156),(27,155),(28,154),(29,153),(30,152),(31,151),(32,150),(33,149),(34,148),(35,147),(36,146),(37,145),(38,144),(39,143),(40,142),(41,141),(42,140),(43,139),(44,138),(45,137),(46,136),(47,135),(48,134),(49,133),(50,132),(51,131),(52,130),(53,129),(54,128),(55,127),(56,126),(57,125),(58,124),(59,123),(60,122),(61,121),(62,120),(63,119),(64,118),(65,117),(66,116),(67,115),(68,114),(69,113),(70,112),(71,111),(72,110),(73,109),(74,108),(75,107),(76,106),(77,105),(78,104),(79,103),(80,102),(81,101),(82,100),(83,99),(84,98),(85,97),(86,96),(87,95),(88,94),(89,93),(90,92)]])`

92 conjugacy classes

 class 1 2 181A ··· 181CL order 1 2 181 ··· 181 size 1 181 2 ··· 2

92 irreducible representations

 dim 1 1 2 type + + + image C1 C2 D181 kernel D181 C181 C1 # reps 1 1 90

Matrix representation of D181 in GL2(𝔽1087) generated by

 563 1086 546 418
,
 158 722 801 929
`G:=sub<GL(2,GF(1087))| [563,546,1086,418],[158,801,722,929] >;`

D181 in GAP, Magma, Sage, TeX

`D_{181}`
`% in TeX`

`G:=Group("D181");`
`// GroupNames label`

`G:=SmallGroup(362,1);`
`// by ID`

`G=gap.SmallGroup(362,1);`
`# by ID`

`G:=PCGroup([2,-2,-181,1441]);`
`// Polycyclic`

`G:=Group<a,b|a^181=b^2=1,b*a*b=a^-1>;`
`// generators/relations`

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