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A073030
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Sum_{k=1..n, gcd(n,k) = 1} 10^(k-1).
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0
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1, 11, 101, 1111, 10001, 111111, 1010101, 11011011, 101000101, 1111111111, 10001010001, 111111111111, 1010100010101, 11010011001011, 101010101010101, 1111111111111111, 10001010001010001, 111111111111111111
(list; graph; refs; listen; history; internal format)
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