Least k such that k and 4k are anagrams in base n (written in base 10).

Terms

a(0) =144a(1) =1360a(2) =76a(3) =532a(4) =16a(5) =1782a(6) =190a(7) =220a(8) =244a(9) =39a(10) =9408a(11) =260a(12) =672a(13) =833a(14) =24a(15) =30324a(16) =560a(17) =1183a(18) =880a(19) =115a(20) =744a(21) =539625a(22) =2574a(23) =40977a(24) =168a(25) =3857a(26) =3310a(27) =4433a(28) =63424a(29) =77