This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A204984 #13 Sep 16 2023 12:02:27 %S A204984 1,1,1,1,3,1,1,1,7,3,93,1,315,1,1,1,15,7,13797,3,3,93,89,1,41943,315, %T A204984 9709,1,9256395,1,1,1,31,15,117,7,1857283155,13797,105,3,25575,3,381, %U A204984 93,91,89,178481,1,42799,41943,5,315,84973577874915,9709,19065,1,4599,9256395 %N A204984 a(n) = (1/n)*A204983(n). %C A204984 For a guide to related sequences, see A204892. %t A204984 (See the program at A204979.) %o A204984 (PARI) a(n) = for (k=1, oo, for (j=1, k-1, my(d=2^(k-1)-2^(j-1)); if (!(d % n), return(d/n)););); \\ _Michel Marcus_, Sep 16 2023 %Y A204984 Cf. A204979, A204892, A204983. %Y A204984 Cf. A023758 (when a(n)=1). %K A204984 nonn %O A204984 1,5 %A A204984 _Clark Kimberling_, Jan 21 2012 %E A204984 More terms from _Michel Marcus_, Sep 16 2023