For base 2 the double-trouble number is
0 1 

For base 10 the double-trouble number is
0 5 2 6 3 1 5 7 8 9 4 7 3 6 8 4 2 1 

For base 35 the double-trouble number is
11 23 

For base 99 the double-trouble number is
0 49 74 37 18 58 78 88 93 96 48 24 12 6 3 1 50 25 12 55 77 38 68 83 91 45 72 36 18 9 4 51 75 37 68 34 17 8 53 76 38 19 9 54 27 13 56 28 14 7 3 51 25 62 31 15 57 28 63 81 40 69 84 42 21 10 54 76 87 93 46 72 85 92 46 23 11 55 27 63 31 65 32 65 82 41 20 59 79 39 69 34 66 82 90 94 96 97 98 49 24 61 80 40 20 10 5 2 50 74 86 92 95 97 48 73 86 43 21 60 30 15 7 53 26 62 80 89 94 47 23 61 30 64 81 90 45 22 60 79 89 44 71 85 42 70 84 91 95 47 73 36 67 83 41 70 35 17 58 29 14 56 77 88 44 22 11 5 52 26 13 6 52 75 87 43 71 35 67 33 66 33 16 57 78 39 19 59 29 64 32 16 8 4 2 1 

For base 100 the double-trouble number is
0 50 25 12 56 28 14 7 3 51 75 87 93 96 98 49 24 62 31 15 57 78 89 44 72 36 18 9 4 52 26 13 6 53 26 63 31 65 82 91 45 72 86 43 21 60 80 40 20 10 5 2 51 25 62 81 40 70 35 17 58 79 39 69 84 92 46 23 11 55 77 88 94 47 23 61 80 90 45 22 61 30 65 32 66 33 16 58 29 14 57 28 64 32 16 8 4 2 1 

For base 200 the double-trouble number is
66 133 

For base 3 the double-trouble number is
0 1 2 1 

For base 5 the double-trouble number is
1 3 

For base 137 the double-trouble number is
45 91 

For base 12 the double-trouble number is
0 6 3 1 6 9 4 8 4 2 1 

For base 8 the double-trouble number is
2 5 

For base 19 the double-trouble number is
0 9 14 7 3 11 5 12 6 3 1 10 5 2 10 14 16 17 18 9 4 11 15 7 13 6 12 15 17 8 13 16 8 4 2 1 

For base 36 the double-trouble number is
0 18 9 4 20 10 5 2 19 9 22 29 14 25 12 24 12 6 3 1 18 27 13 24 30 15 7 21 28 32 16 8 4 2 1