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Search: id:A073030
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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 1
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| 1, 11, 101, 1111, 10001, 111111, 1010101, 11011011, 101000101, 1111111111, 10001010001, 111111111111, 1010100010101, 11010011001011, 101010101010101, 1111111111111111, 10001010001010001, 111111111111111111
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