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 A185199 #16 Sep 28 2022 13:52:10 %S A185199 4,0,5,2,8,4,7,3,4,5,6,9,3,5,1,0,8,5,7,7,5,5,1,7,8,5,2,8,3,8,9,1,0,5, %T A185199 5,5,6,1,7,4,3,5,0,9,8,6,8,8,9,8,6,1,9,5,3,8,2,4,3,6,1,2,7,5,7,6,6,9, %U A185199 2,4,8,3,8,4,8,9,4,1,7,6,4,7,6,4,8,3,7,0,9,5,7,0,2,4,8,7,3,5,0 %N A185199 Decimal expansion of 4/Pi^2. %C A185199 Density of the odd squarefree numbers A056911. - _Charles R Greathouse IV_, Jun 08 2016 %D A185199 C. F. Gauss, Disquisitiones Arithmeticae, Yale, 1965; see p. 359. %H A185199 G. C. Greubel, <a href="/A185199/b185199.txt">Table of n, a(n) for n = 0..5000</a> %H A185199 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A185199 0.40528473456935108577551785283891055561743509868898619538243... %t A185199 RealDigits[4/Pi^2, 10, 50][[1]] (* _G. C. Greubel_, Jun 24 2017 *) %o A185199 (PARI) 4/Pi^2 \\ _Charles R Greathouse IV_, Jun 08 2016 %K A185199 cons,nonn %O A185199 0,1 %A A185199 _N. J. A. Sloane_, Feb 19 2011