1 1 2 10 3 100 4 1000 5 10000 6 100000 7 1000000 8 10000000 9 100000000 10 9 11 99 12 999 13 9999 14 99999 15 999999 16 9999999 17 99999999 18 999999999 19 61 20 1100 21 509 22 510 23 1013 24 0 25
1 1 2 10 3 100 4 1000 5 10000 6 100000 7 1000000 8 10000000 9 100000000 10 9 11 99 12 999 13 9999 14 99999 15 999999 16 9999999 17 99999999 18 999999999 19 61 20 1100 21 509 22 510 23 1013 24 0 25