[1,2,11,12,21,22,31,32,41,42,101,1001,1002,1011, 1012,1021,1022,1031,1032,10001,100001,100002, 100011,100012,100021,100022,100031,100032,1000001, 10000001,10000002,10000011,10000012,10000021, 10000022]