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A123052
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Numbers k that divide 5^k + 3.
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9
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1, 2, 4, 14, 628, 11524, 16814, 188404, 441484, 2541014, 3984724, 172315684, 208268941, 40874725514, 280454588548, 489850370956, 1235856817732, 62479203805793, 95467808763364, 116016015619396, 396249210287836
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OFFSET
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1,2
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COMMENTS
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No other terms below 10^15. A larger term: 783847656467936404. - Max Alekseyev, Oct 16 2016
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LINKS
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MATHEMATICA
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Select[Range[1000000], IntegerQ[(PowerMod[5, #, # ]+3)/# ]&]
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PROG
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CROSSREFS
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Solutions to 5^n == k (mod n): A067946 (k=1), A015951 (k=-1), A124246 (k=2), A123062 (k=-2), A123061 (k=3), this sequence (k=-3), A125949 (k=4), A123047 (k=-4), A123091 (k=5), A015891 (k=-5), A277350 (k=6), A277348 (k=-6).
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KEYWORD
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hard,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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