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    Article

    Odd 4-Perfect Numbers Exactly Divisible by \(3^2\)

    We call a positive integer N a 4-perfect number if the sum of all divisors of N is equal to 4N. In this paper, we give some sufficient conditions such that an odd integer exactly divisible by \(3^2\)32 cannot be ...

    Yuta Okabe, Sachiko Ohtani in Bulletin of the Malaysian Mathematical Sciences Society (2020)

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    Article

    Effect of carperitide on in-hospital mortality of patients admitted for heart failure: propensity score analyses

    Although a previous randomized study showed that the use of atrial natriuretic peptide (carperitide) improved the long-term prognosis of patients with heart failure, its effect on short-term prognosis remains ...

    Masataka Ogiso, Toshiaki Isogai, Yuta Okabe, Kansuke Ito, Masaki Tsuji… in Heart and Vessels (2017)