Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #11 Mar 28 2020 10:26:53
%S 0,34,70,68,1,8,31,6,44,35,86,42,25,65,71,40,89,78,81,69,5,24,77,76,2,
%T 59,18,3,13,9,46,74,60,27,32,16,91,19,95,7,85,39,4,58,45,15,84,14,62,
%U 36,63,93,10,52,87,37,55,47,67,43,64,80,75,12,26,94,57,61,51,66,11,50,28,29,72,53,21,33,30,41,88,23,17,73,90,38,83,92,54,79,56,49,20,22,82,48
%N Log base 5 (n) mod 97.
%D I. M. Vinogradov, Elements of Number Theory, p. 225.
%H I. M. Vinogradov, <a href="https://isidore.co/calibre/get/pdf/4459">Elements of Number Theory</a>, Translation of 5th revised edition, Dover Publications Inc., 1954, p. 225.
%F Row n=25 of T(n,k) in A054503. - _Georg Fischer_, Jan 19 2020
%t a[1]=0; a[n_]:=MultiplicativeOrder[5, 97, {n}]; Array[a, 96] (* _Vincenzo Librandi_, Mar 28 2020 *)
%Y Cf. A054503.
%K nonn,fini,full
%O 1,2
%A _N. J. A. Sloane_.
%E a(60)-a(96) from _Georg Fischer_, Jan 19 2020