The values of k in A220143.

Terms

a(0) =4a(1) =6a(2) =9a(3) =18a(4) =24a(5) =42a(6) =54a(7) =120a(8) =258a(9) =396a(10) =420a(11) =594a(12) =744a(13) =840a(14) =1074a(15) =1800a(16) =2130a(17) =2172a(18) =2256a(19) =2304a(20) =2550a(21) =2778a(22) =3282a(23) =3792a(24) =3894a(25) =4170a(26) =4488a(27) =4578a(28) =4626a(29) =4848