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A055690
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Numbers k such that 7^k == -1 (mod k-1).
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3
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2, 3, 5, 6, 9, 26, 45, 66, 87, 345, 765, 906, 3926, 8405, 11766, 23805, 35145, 42966, 59685, 95289, 317250, 413325, 416757, 722745, 770066, 890825, 938457, 1325826, 1921986, 3315378, 3675555, 5299250, 6791445, 6899685, 9371826, 10892313
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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[7, n, n-1]==n-2, Print[n]], {n, 2, 2*10^7}]
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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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