▁not ▁necessarily ▁~ 3 7 . 3 9 5 %. ▁An ▁Un real Script ▁program ▁that ▁comput es ▁the ▁lengths ▁of ▁rec urr ing ▁periods ▁of ▁various ▁fra ctions ▁in ▁a ▁given ▁set ▁of ▁bases ▁found ▁that , ▁of ▁the ▁first ▁ 1 5 , 4 5 6 ▁pr imes , ▁~ 3 9 . 3 4 4 % ▁are ▁cy clic ▁in ▁v iges imal . ▁ ▁Real ▁numbers ▁ ▁Use ▁In ▁many ▁European ▁languages , ▁ 2 0 ▁is ▁used ▁as ▁a ▁base , ▁at ▁least ▁with ▁respect ▁to ▁the ▁lingu istic ▁structure ▁of ▁the ▁names ▁of ▁certain ▁numbers ▁( though ▁a ▁thorough going ▁consistent ▁v iges imal ▁system , ▁based ▁on ▁the ▁powers ▁ 2 0 , ▁ 4 0 0 , ▁ 8 0 0 0 ▁etc ., ▁is ▁not ▁generally ▁used ). ▁ ▁The ▁Open ▁Location ▁Code , ▁used ▁for ▁encoding ▁ge ographic ▁areas ▁uses ▁a ▁base ▁ 2 0 ▁encoding ▁of ▁coordinates . ▁ ▁Africa ▁V iges imal ▁systems ▁are ▁common ▁in ▁Africa , ▁for ▁example ▁in ▁Y or uba . ▁ ▁Og ún , ▁ 2 0 , ▁is ▁the ▁basic ▁numeric ▁block . ▁Og ój ì , ▁ 4 0 , ▁( O g ún - me ji ) ▁= ▁ 2 0 ▁multip lied ▁by ▁ 2 ▁( è j ì ). ▁Og ota , ▁ 6 0 , ▁( O g ún - m <0xE1> <0xBA> <0xB9> ̀ ta ) ▁= ▁ 2 0 ▁multip lied ▁by ▁ 3 ▁( <0xE1> <0xBA> <0xB9>