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 #13 Aug 21 2021 07:07:57
%S 0,1,72,2,27,73,8,3,62,28,24,74,77,9,17,4,56,63,47,29,80,25,60,75,54,
%T 78,52,10,12,18,38,5,14,57,35,64,20,48,67,30,40,81,71,26,7,61,23,76,
%U 16,55,46,79,59,53,51,11,37,13,34,19,66,39,70,6,22,15,45,58,50,36,33,65,69,21,44,49,32,68,43,31,42,41
%N Log base 2 (n) mod 83.
%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=23 of T(n,k) in A054503. - _Georg Fischer_, Jan 19 2020
%p a:= n-> numtheory[mlog](n, 2, 83):
%p seq(a(n), n=1..82); # _Alois P. Heinz_, Aug 21 2021
%t a[1]=0; a[n_]:=MultiplicativeOrder[2, 83, {n}]; Array[a, 82] (* _Vincenzo Librandi_, Apr 04 2020 *)
%Y Cf. A054503.
%K nonn,fini,full
%O 1,3
%A _N. J. A. Sloane_.
%E a(60)-a(82) from _Georg Fischer_, Jan 19 2020