A216065 a(n) is the conjectured highest power of n which has no four identical digits in succession.
35864, 19590, 17932, 14103, 9702, 10061, 8892, 9795, 3, 6889, 8069, 8742, 6448, 6553, 8966, 4594, 6800, 6670, 3, 4869, 5061, 5635, 6001, 3784, 6450, 6530, 4631, 4930, 3, 4777, 4947, 6889, 4902, 5220, 4851, 4276, 3281, 4541, 3, 3679, 5302, 5279, 5271, 3317, 4296, 4331, 4930, 4921
Offset: 2