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A108908
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Largest n-digit number coprime to n.
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0
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9, 99, 998, 9999, 99999, 999997, 9999999, 99999999, 999999998, 9999999999, 99999999999, 999999999997, 9999999999999, 99999999999999, 999999999999998, 9999999999999999, 99999999999999999, 999999999999999997
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OFFSET
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1,1
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COMMENTS
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a(286) = 10^286 - 5 is the first term with a(n) < 10^n - 3. - Rick L. Shepherd
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LINKS
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MATHEMATICA
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f[n_] := Block[{k=10^n-1}, While[ GCD[n, k]>1, k-- ]; k]; Table[ f[n], {n, 18}] (* Robert G. Wilson v *)
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PROG
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(PARI) for(n=1, 300, m=10^n-1; while(gcd(m, n)>1, m--); print1(m, ", ")) (Rick L. Shepherd)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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