22/7 (read as Nanabun no Nijūni (ナナブンノニジュウニ Twenty Two Per Seven)) is a Japanese idol project between Yasushi Akimoto, Aniplex, and Sony Music Records. The project is described as "Idols Who Transcend Dimensions". The name was chosen because it is an approximation of pi, an irrational number that can not be expressed in integer division.
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