Weber's class number problem in the cyclotomic Z2-extension of Q III

Takashi Fukuda*, Keiichi Komatsu

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)


    Let hn denote the class number of Q(2 cos2π/2n+2) which is a cyclic extension of degree 2n over the rational number field Q. There are no known examples of hn > 1. We prove that a prime number ℓ does not divide hn for all n < 1 if ℓ is less than 109 or ℓ satisfies a congruence relation ℓ ≢ ± 1 (mod 32).

    Original languageEnglish
    Pages (from-to)1627-1635
    Number of pages9
    JournalInternational Journal of Number Theory
    Issue number6
    Publication statusPublished - 2011 Sep


    • Class number
    • computation

    ASJC Scopus subject areas

    • Algebra and Number Theory


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