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A116636
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Positive integers k such that 13^k == 9 (mod k).
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14
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1, 2, 4, 8, 10, 172, 296, 332, 410, 872, 1048, 1070, 1544, 2830, 3470, 7486, 9196, 22184, 90892, 121174, 299816, 575206, 885112, 1329388, 1386430, 2518994, 4167272, 5600212, 8475016, 9180370, 12348446, 18483076, 19185890, 20806274, 28984094, 37114141
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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Join[{1, 2, 4, 8}, Select[Range[1, 9000], Mod[13^#, #] == 9 &]] (* G. C. Greubel, Nov 19 2017 *)
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PROG
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(PARI) isok(n) = Mod(13, n)^n == 9; \\ Michel Marcus, Nov 19 2017
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CROSSREFS
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Solutions to 13^n == k (mod n): A001022 (k=0), A015963 (k=-1), A116621 (k=1), A116622 (k=2), A116629 (k=3), A116630 (k=4), A116611 (k=5), A116631 (k=6), A116632 (k=7), A295532 (k=8), this sequence (k=9), A116620 (k=10), A116638 (k=11), A116639 (k=15).
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KEYWORD
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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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