The answer is 1111111101.
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12345679
12345679 + 987654321 = 1000000000
they are 12345679 stink
1, 3, 9, 37, 111, 333, 333667, 1001001, 3003003, 12345679, 37037037, 111111111
0.01234567901 as a fraction is 12345679/1000000000.