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Carol number : ウィキペディア英語版
Carol number
A Carol number is an integer of the form 4^n - 2^ - 1. An equivalent formula is (2^n - 1)^2 - 2. 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,
:\sum_^ 2^.
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 2^. This gives yet another equivalent expression for Carol numbers, (2^ - 1) - 2^. 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)
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