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A055688
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Numbers k such that 5^k == -1 (mod k-1).
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3
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2, 3, 7, 14, 15, 175, 855, 2695, 78127, 103974, 106695, 121975, 420210, 487375, 1299375, 2174655, 3895095, 4151455, 5842215, 5951130, 6508335, 10637055, 20117895, 24482958, 31999695, 32282054, 32620203, 32872455, 34258455
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Do[If[PowerMod[5, n, n-1]==n-2, Print[n]], {n, 2, 10^8}]
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CROSSREFS
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KEYWORD
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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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