Primitive 4-abundant numbers: Numbers k such that sigma(k) > 4k (A068404) all of whose proper divisors d are 4-deficient numbers (having sigma(d) < 4d).

A307114

Primitive 4-abundant numbers: Numbers k such that sigma(k) > 4k (A068404) all of whose proper divisors d are 4-deficient numbers (having sigma(d) < 4d).

Terms

    a(0) =27720a(1) =50400a(2) =75600a(3) =85680a(4) =95760a(5) =105840a(6) =115920a(7) =120120a(8) =128520a(9) =141120a(10) =143640a(11) =176400a(12) =180180a(13) =184800a(14) =205920a(15) =207900a(16) =214200a(17) =218400a(18) =235620a(19) =239400a(20) =264600a(21) =289800a(22) =292320a(23) =299880a(24) =308880a(25) =312480a(26) =314160a(27) =351120a(28) =371280a(29) =372960

External references