Numbers k such that there is an anti-divisor d of k satisfying sigma(d) = k.

Terms

a(0) =3a(1) =4a(2) =13a(3) =32a(4) =40a(5) =60a(6) =121a(7) =364a(8) =1093a(9) =3200a(10) =3280a(11) =9841a(12) =15120a(13) =16380a(14) =29282a(15) =29524a(16) =88573a(17) =91728a(18) =264992a(19) =265720a(20) =797161a(21) =2391484a(22) =7174453a(23) =21523360a(24) =40098240a(25) =64570081a(26) =71495424a(27) =78427440a(28) =193690562a(29) =193710244