A043391 Numbers n such that number of 5's in base 6 is 3.

215, 431, 647, 863, 1079, 1115, 1151, 1187, 1223, 1259, 1265, 1271, 1277, 1283, 1289, 1290, 1291, 1292, 1293, 1294, 1511, 1727, 1943, 2159, 2375, 2411, 2447, 2483, 2519, 2555, 2561, 2567, 2573, 2579, 2585, 2586, 2587