One seventh = 0.142857142857. What is the sum of the first 80 digits after the decimal point?

The six decimal places are 1, 4, 2, 8, 5, 7, and 27
The next six are still 1, 4, 2, 8, 5, 7
80÷6=13.2
So there are 13 such six, and the first two, namely 1 and 4
So the sum of the first 80 digits after the decimal point is 13 × 27 + 1 + 4 = 355

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