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希尔伯特数

数论中,希尔伯特数Hilbert number)是指满足4n + 1的正整数[1],希尔伯特数是因数学家大卫·希尔伯特而得名。希尔伯特数形成的整数数列为1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, … (OEIS数列A016813)。

希尔伯特质数是指一个无法被1以外较小的希尔伯特数整除的整数,希尔伯特质数形成的整数数列为5, 9, 13, 17, 21, 29, 33, 37, 41, 49, ... (OEIS数列A057948)。希尔伯特数本身不一定要为质数,例如21即为一个合数。利用关于模4同余的乘法运算,可得希尔伯特质数可能是4n + 1形式的质数(毕达哥拉斯质数),或者是 (4a + 3) × (4b + 3)形式的半质数

参考资料

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  1. ^ Flannery, S.; Flannery, D., In Code: A Mathematical Journey, Profile Books: p.35, 2000 

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希尔伯特数
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