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A123047
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Numbers k that divide 5^k + 4.
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16
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OFFSET
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1,2
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COMMENTS
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Large term (may not be the next one): 3014733401203184049549. - Max Alekseyev, Oct 18 2013
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LINKS
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MATHEMATICA
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Do[ If[ PowerMod[5, 2n - 1, 2n - 1] + 5 == 2n, Print[2n - 1]], {n, 10^9}] (* Robert G. Wilson v *)
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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), A123052 (k=-3), A125949 (k=4), this sequence (k=-4), A123091 (k=5), A015891 (k=-5), A277350 (k=6), A277348 (k=-6).
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KEYWORD
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hard,more,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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