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In number theory, a bi-twin chain of length ''k'' + 1 is a sequence of natural numbers : in which every number is prime.〔Eric W. Weisstein, ''CRC Concise Encyclopedia of Mathematics'', CRC Press, 2010, page 249.〕 The numbers form a Cunningham chain of the first kind of length , while forms a Cunningham chain of the second kind. Each of the pairs is a pair of twin primes. Each of the primes for is a Sophie Germain prime and each of the primes for is a safe prime. == Largest known bi-twin chains == ''q''# denotes the primorial 2×3×5×7×...×''q''. , the longest known bi-twin chain is of length 8. 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「Bi-twin chain」の詳細全文を読む スポンサード リンク
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