Abundancy of the abundant or perfect numbers: m = sigma(k)-2k for n such that m >= 0.

Terms

a(0) =0a(1) =4a(2) =3a(3) =2a(4) =12a(5) =0a(6) =12a(7) =19a(8) =10a(9) =12a(10) =28a(11) =12a(12) =8a(13) =48a(14) =12a(15) =4a(16) =51a(17) =12a(18) =26a(19) =56a(20) =4a(21) =54a(22) =60a(23) =17a(24) =12a(25) =2a(26) =64a(27) =24a(28) =12a(29) =120