Numbers k such that sigma(k) = 3*sigma(k+1).

Terms

a(0) =180a(1) =12000a(2) =30996a(3) =47940a(4) =66780a(5) =102816a(6) =128040a(7) =234300a(8) =494088a(9) =712272a(10) =1133088a(11) =1408212a(12) =1623072a(13) =1692768a(14) =1896336a(15) =1925196a(16) =2024760a(17) =2388720a(18) =2529090a(19) =2836008a(20) =3423120a(21) =3724320a(22) =3822360a(23) =4628760a(24) =4750920a(25) =7219608a(26) =7359912a(27) =7603488a(28) =7749060