A054510 - OEIS

%I #14 Jul 31 2021 05:09:48

%S 7,11,11,6,19,12,28,32,39,35,32,14,18,49,23,1,33,53,8,81,31,9,4,43,40,

%T 8,115,96,42,50,142,67,147,73,118,95,171,15,171,104,146,142,139,210,

%U 154,107,222,1,1,248,85,79,19,142,22,182,278,213,116,140,123,50,81,318

%N Log_b 7 where b is smallest primitive root (A001918) mod n-th prime.

%D Tom M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976, Table 10.2, pp. 216-217.

%H Amiram Eldar, <a href="/A054510/b054510.txt">Table of n, a(n) for n = 5..10000</a>

%t a[n_] := Module[{p, b, lg = 1}, b = PrimitiveRoot[p = Prime[n]]; While[ PowerMod[b, lg, p] != 7, lg++]; lg]; Array[a, 100, 5] (* _Jean-François Alcover_, Sep 03 2016 *)

%Y Cf. table in A054503.

%Y Cf. A001918, A054505, A054506, A054507, A054508, A054509, A054511, A054512, A054513.

%K nonn,easy

%O 5,1

%A _N. J. A. Sloane_, Apr 09 2000

%E More terms from _James A. Sellers_, Apr 09 2000