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In number theory, Vantieghems theorem is a primality criterion. It states that a natural number ''n'' is prime if and only if : Similarly, ''n'' is prime, if and only if the following congruence for polynomials in ''X'' holds: : or: : == Example == Let n=7 forming the product 1 *3 *7 *15 *31 *63 = 615195. 615195 = 7 mod 127 and so 7 is prime Let n=9 forming the product 1 *3 *7 *15 *31 *63 *127 *255 = 19923090075. 19923090075 = 301 mod 511 and so 9 is composite 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「Vantieghems theorem」の詳細全文を読む スポンサード リンク
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