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 A021058 #20 Jul 08 2025 07:59:35
%S A021058 0,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,
%T A021058 1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,
%U A021058 8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8,5,1,8
%N A021058 Decimal expansion of 1/54.
%C A021058 5/27 = 10 * (1/54) is the probability that a point uniformly selected at random in an equilateral triangle is closer to the center than to its closest edge (Atkins, 1989). - _Amiram Eldar_, Jun 23 2022
%H A021058 Joel Atkins, <a href="https://www.jstor.org/stable/24339911">Regular Polygon Targets</a>, Pi Mu Epsilon Journal, Vol. 9, No. 3 (1989), pp. 142-144; <a href="http://www.pme-math.org/journal/issues/PMEJ.Vol.9.No.3.pdf">entire issue</a>.
%H A021058 <a href="/index/Rec#order_03">Index entries for linear recurrences with constant coefficients</a>, signature (0, 0, 1).
%e A021058 0.0185185185185185185185185185...
%t A021058 Join[{0}, RealDigits[1/54, 10, 100][[1]]] (* _Amiram Eldar_, Jun 23 2022 *)
%K A021058 nonn,cons,easy
%O A021058 0,3
%A A021058 _N. J. A. Sloane_