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 A091721 #11 May 25 2024 23:32:49
%S A091721 5,27,16,21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,21,
%T A091721 49,5,27,16,21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,
%U A091721 21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,21,49,5,27,16,21
%N A091721 Babylonian sexagesimal (base 60) expansion of 1/11.
%C A091721 Period 5: repeat [5, 27, 16, 21, 49]. - _Wesley Ivan Hurt_, May 25 2024
%H A091721 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 0, 0, 1).
%F A091721 From _Wesley Ivan Hurt_, May 25 2024: (Start)
%F A091721 a(n+5) = a(n).
%F A091721 G.f.: (5+27*x+16*x^2+21*x^3+49*x^4)/(1-x^5). (End)
%t A091721 RealDigits[ 1/11, 60, 75] [[1]] (* _Robert G. Wilson v_, Feb 02 2004 *)
%t A091721 CoefficientList[Series[(5 + 27 x + 16 x^2 + 21 x^3 + 49 x^4)/(1 - x^5), {x, 0, 40}], x] (* _Wesley Ivan Hurt_, May 25 2024 *)
%Y A091721 Cf. A092291, A091720, A091722, A055643.
%Y A091721 Cf. A159991. - _Reinhard Zumkeller_, May 02 2009
%K A091721 base,easy,nonn
%O A091721 0,1
%A A091721 _Jeppe Stig Nielsen_, Feb 01 2004