Всего таких чисел 1111 штук.
0, 1, 900, 01, 09, 10, 11, 19, 90, 91, 99000, 001, 009, 010, 011, 019, 090, 091, 099, 100, 101, 109, 110, 111, 119, 190, 191, 199, 900, 901, 909, 910, 911, 919, 990, 991, 9990000, 0001, 0009, 0010, 0011, 0090, 0091, 0099, 0100, 0101, 0109, 0110, 0111, 0119, 0190, 0191, 0199, 0900, 0901, 0909, 0910, 0911, 0919, 0990, 0991, 0999, 1000, 1001, 1009, 1010, 1011, 1019, 1090, 1091, 1099, 1100, 1101, 1109, 1110, 1111, 1119, 1190, 1191, 1199, 1900, 1901, 1909, 1910, 1911, 1919, 1990, 1991, 1999, 9000, 9001, 9009, 9010, 9011, 9019, 9090, 9091, 9099, 9100, 9101, 9109, 9110, 9111, 9119, 9190, 9191, 9199, 9900, 9901, 9909, 9910, 9911, 9919, 9990, 9991, 9999.
Всего таких чисел 1111 штук.
0, 1, 9
00, 01, 09, 10, 11, 19, 90, 91, 99
000, 001, 009, 010, 011, 019, 090, 091, 099, 100, 101, 109, 110, 111, 119, 190, 191, 199, 900, 901, 909, 910, 911, 919, 990, 991, 999
0000, 0001, 0009, 0010, 0011, 0090, 0091, 0099, 0100, 0101, 0109, 0110, 0111, 0119, 0190, 0191, 0199, 0900, 0901, 0909, 0910, 0911, 0919, 0990, 0991, 0999, 1000, 1001, 1009, 1010, 1011, 1019, 1090, 1091, 1099, 1100, 1101, 1109, 1110, 1111, 1119, 1190, 1191, 1199, 1900, 1901, 1909, 1910, 1911, 1919, 1990, 1991, 1999, 9000, 9001, 9009, 9010, 9011, 9019, 9090, 9091, 9099, 9100, 9101, 9109, 9110, 9111, 9119, 9190, 9191, 9199, 9900, 9901, 9909, 9910, 9911, 9919, 9990, 9991, 9999.