Minimum number k for which the digital sum of k*n is 3*n.

Terms

a(0) =0a(1) =3a(2) =3a(3) =3a(4) =12a(5) =39a(6) =33a(7) =57a(8) =111a(9) =111a(10) =3999a(11) =3909a(12) =2499a(13) =3846a(14) =6357a(15) =33333a(16) =43743a(17) =52347a(18) =111111a(19) =310521a(20) =3999999a(21) =947619a(22) =3090909a(23) =3473913a(24) =16666662a(25) =39999999a(26) =34576923a(27) =37037037a(28) =246428571a(29) =310337931