A068861 a(1) = 1; a(n) is the smallest number not already in the sequence which differs from a(n) at every digit.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 12, 20, 11, 22, 13, 24, 15, 23, 14, 25, 16, 27, 18, 26, 17, 28, 19, 30, 29, 31, 40, 32, 41, 33, 42, 34, 43, 35, 44, 36, 45, 37, 46, 38, 47, 39, 48, 50, 49, 51, 60, 52, 61, 53, 62, 54, 63, 55, 64, 56, 65, 57, 66, 58, 67, 59, 68, 70, 69, 71, 80