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A045596
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Numbers k that divide 7^k + 5^k.
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1
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1, 2, 3, 9, 27, 39, 74, 81, 117, 243, 351, 507, 729, 1053, 1521, 2187, 2738, 3081, 3159, 4563, 6123, 6561, 6591, 9243, 9477, 12207, 13689, 18369, 19683, 19773, 27729, 28431, 36621, 40053, 41067, 43882, 55107, 59049, 59319, 79599, 83187, 85293
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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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Select[Range[86000], Mod[PowerMod[7, #, #]+PowerMod[5, #, #], #]==0&] (* Harvey P. Dale, Aug 02 2023 *)
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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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