Cubefree superabundant numbers: cubefree numbers (A004709) k such that sigma(k)/k > sigma(j)/j for all cubefree numbers j < k.

A308618

Cubefree superabundant numbers: cubefree numbers (A004709) k such that sigma(k)/k > sigma(j)/j for all cubefree numbers j < k.

Terms

    a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =30a(6) =36a(7) =60a(8) =180a(9) =420a(10) =1260a(11) =4620a(12) =6300a(13) =13860a(14) =69300a(15) =180180a(16) =900900a(17) =3063060a(18) =15315300a(19) =58198140a(20) =290990700a(21) =1338557220a(22) =2036934900a(23) =6692786100a(24) =38818159380a(25) =46849502700a(26) =194090796900

External references