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A215258
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Smallest number h such that (2n+1)*h is a repunit (A002275), or 0 if no such h exists.
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1
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1, 37, 0, 15873, 12345679, 1, 8547, 0, 65359477124183, 5847953216374269, 5291, 48309178743961352657, 0, 4115226337448559670781893, 38314176245210727969348659, 3584229390681, 3367, 0, 3, 2849, 271, 2583979328165374677, 0
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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Table[If[GCD[n, 10] > 1, 0, k = MultiplicativeOrder[10, 9*n]; (10^k - 1)/(9*n)], {n, 1, 51, 2}] (* T. D. Noe, Sep 11 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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