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・ 222 Jarvis Street
・ 222 Lucia
・ 222 Main
・ 222 Second Street
・ 2223 Sarpedon
・ 22260 Ur
・ 2227 Otto Struve
・ 2228 Soyuz-Apollo
・ 222d Command and Control Squadron
・ 222nd Battalion, CEF
・ 222nd Broadcast Operations Detachment (BOD)
・ 222nd Coastal Division (Italy)
・ 222nd Infantry Brigade (United Kingdom)
・ 222nd Mixed Brigade
・ 223
223 (number)
・ 223 BC
・ 223 Robert Street, Victoria, British Columbia
・ 223 Rosa
・ 223 series
・ 2235
・ 223d Combat Communications Squadron
・ 223rd
・ 223rd Battalion (Canadian Scandinavians), CEF
・ 223rd Brigade (United Kingdom)
・ 223rd Coastal Division (Italy)
・ 223rd Infantry Regiment (United States)
・ 223rd Military Intelligence Battalion (United States)
・ 223rd Mixed Brigade
・ 223rd Mixed Brigade (Spain)


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

223 is the natural number between 222 and 224.
223 is a prime number. It is the smallest prime for which the two nearest primes on either side of it are 16 units apart. Among the 720 permutations of the numbers from 1 to 6, exactly 223 of them have the property that at least one of the numbers is fixed in place by the permutation and the numbers less than it and greater than it are separately permuted among themselves.
In connection with Waring's problem, 223 requires the maximum number of terms (37 terms) when expressed as a sum of positive fifth powers, and is the only number that requires that many terms.
==References==



抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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