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 A021516 #14 Jul 08 2025 08:33:22
%S A021516 0,0,1,9,5,3,1,2,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%T A021516 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
%U A021516 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
%N A021516 Decimal expansion of 1/512.
%C A021516 Note that this is 1/2^9, and 5^9 = 1953125. Also, 1/5^9 = 0.000000512. These are of course merely consequences of our base of numeration being 2 * 5. - _Alonso del Arte_, Apr 16 2018
%H A021516 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%e A021516 1/512 = 0.001953125.
%t A021516 Join[{0, 0}, RealDigits[1/512, 10][[1]]] (* _Alonso del Arte_, Apr 16 2018 *)
%Y A021516 Cf. A021260 (1/256), A069181 (1/1024).
%K A021516 nonn,cons,easy
%O A021516 0,4
%A A021516 _N. J. A. Sloane_