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A177905
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Numbers k such that k^3 divides 5^(k^2) - 1.
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15
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1, 2, 4, 6, 12, 26, 42, 52, 68, 78, 84, 114, 156, 186, 204, 222, 228, 372, 444, 546, 798, 876, 884, 1092, 1218, 1252, 1302, 1378, 1428, 1482, 1554, 1596, 1806, 2418, 2436, 2604, 2652, 2756, 2886, 2964, 3108, 3534, 3606, 3612, 3756, 3876, 4134, 4218, 4836
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OFFSET
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1,2
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LINKS
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MAPLE
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MATHEMATICA
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Join[{1}, Select[Range[5000], PowerMod[5, #^2, #^3]==1&]] (* Harvey P. Dale, May 04 2017 *)
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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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