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A054507
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Log_b 4 where b is smallest primitive root (A001918) mod n-th prime.
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9
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2, 4, 2, 2, 12, 2, 4, 2, 18, 2, 12, 12, 36, 2, 2, 2, 2, 12, 16, 8, 2, 32, 68, 2, 88, 2, 6, 24, 18, 2, 20, 2, 2, 140, 126, 2, 80, 2, 2, 2, 88, 68, 2, 14, 2, 138, 2, 42, 144, 132, 140, 220, 96, 118, 2, 38, 18, 128, 36, 2, 186, 44, 236, 2, 242, 272, 2, 2, 328, 270, 218, 2, 2, 268, 2
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OFFSET
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3,1
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REFERENCES
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Tom M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976, Table 10.2, pp. 216-217.
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LINKS
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MATHEMATICA
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a[n_] := Module[{p, b, lg = 1}, b = PrimitiveRoot[p = Prime[n]]; While[ PowerMod[b, lg, p] != 4, lg++]; lg]; Array[a, 100, 3] (* Jean-François Alcover, Sep 03 2016 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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