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A177243
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Numbers k such that k^3 divides 10^(k^2) - 1.
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15
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1, 3, 9, 111, 333, 1467, 6813, 54279, 84573, 252081, 607947, 665667, 1001001, 1110519, 1823841, 3003003, 3129201, 12914001, 13785399, 22161609, 22957083, 37037037, 41089203, 49235049, 64021761, 92840751, 108503721, 111111111
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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Join[{1}, Select[Range[1112*10^5], PowerMod[10, #^2, #^3]==1&]] (* Harvey P. Dale, Sep 10 2019 *)
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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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