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A Carol number is an integer of the form . An equivalent formula is . The first few Carol numbers are: −1, 7, 47, 223, 959, 3967, 16127, 65023, 261119, 1046527 . Carol numbers were first studied by Cletus Emmanuel, who named them after a friend, Carol G. Kirnon.〔(Cletus Emmanuel ) at Prime Pages〕〔(Message to Yahoo primenumbers group ) from Cletus Emmanuel〕 ==Binary representation== For ''n'' > 2, the binary representation of the ''n''-th Carol number is ''n'' − 2 consecutive ones, a single zero in the middle, and ''n'' + 1 more consecutive ones, or to put it algebraically, : So, for example, 47 is 101111 in binary, 223 is 11011111, etc. The difference between the 2''n''-th Mersenne number and the ''n''-th Carol number is . This gives yet another equivalent expression for Carol numbers, . The difference between the ''n''-th Kynea number and the ''n''-th Carol number is the (''n'' + 2)th power of two. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Carol number」の詳細全文を読む スポンサード リンク
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