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2 and 9 are the only biunitary superperfect numbers - MaRDI portal

2 and 9 are the only biunitary superperfect numbers (Q4684644)

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scientific article; zbMATH DE number 6941984
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2 and 9 are the only biunitary superperfect numbers
scientific article; zbMATH DE number 6941984

    Statements

    author
    Tomohiro Yamada
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    publication date
    24 September 2018
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    zbMATH Keywords
    unitary divisors
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    biunitary divisors
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    sum of divisors type functions
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    iterates of arithmetic functions
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    biunitary superperfect numbers
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    arXiv classification
    math.NT
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    Identifiers

    zbMATH DE Number
    6941984
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    arXiv ID
    1705.00189
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