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・ 2058
・ 2059
・ 2059 Baboquivari
・ 205th (2nd Welsh Border) Brigade
・ 205th (Tiger) Battalion, CEF
・ 205th Coastal Division (Italy)
・ 205th Commando Brigade
・ 205th Corps
・ 205th Division
・ 205th Independent Infantry Brigade (Home)
・ 205th Infantry Brigade (United States)
・ 205th Infantry Division (Wehrmacht)
・ 205th Military Intelligence Brigade (United States)
・ 205th Pennsylvania Infantry
・ 206
206 (number)
・ 206 (Ulster) Battery Royal Artillery
・ 206 BC
・ 206 Bones
・ 206 Hersilia
・ 2060
・ 2060 Chiron
・ 2060s
・ 2061
・ 2061 (disambiguation)
・ 2061 Anza
・ 2062
・ 2062 Aten
・ 2063
・ 2063 Bacchus


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206 (number) : ウィキペディア英語版
206 (number)

206 (two hundred () six) is the natural number following 205 and preceding 207.
==In mathematics==
206 is both a nontotient and a noncototient. It is the lowest positive integer (when written in English) to employ all of the vowels once only. The other numbers sharing this property are 230, 250, 260, 602, 640, 5000, 8000, 9000, 80,000 and 90,000. 206 and 207 form the second pair of consecutive numbers (after 14 and 15) whose sums of divisors are equal. There are exactly 206 different linear forests on five labeled nodes, and exactly 206 regular semigroups of order four up to isomorphism and anti-isomorphism.

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