do9bvanc
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We can't use the number "7", so we count like this: 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 19, 20, ... 65, 66, 68, 69, 80, 81, 82, 83, 84, ... What is the 2007th number? (And how can you count it out?)