Numbers k such that both sigma_{-1}(k) > 2 and sigma_0(k)/sigma_{-1}(k) are integers.

A340864

Numbers k such that both sigma_{-1}(k) > 2 and sigma_0(k)/sigma_{-1}(k) are integers.

Terms

    a(0) =672a(1) =30240a(2) =32760a(3) =2178540a(4) =23569920a(5) =45532800a(6) =142990848a(7) =459818240a(8) =1379454720a(9) =14182439040a(10) =43861478400a(11) =51001180160a(12) =66433720320a(13) =153003540480a(14) =403031236608a(15) =704575228896

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