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 A180310 #18 May 26 2025 15:25:14 %S A180310 2,9,7,5,5,6,7,8,2,0,5,9,7,3,3,9,3,3,0,8,0,2,5,1,5,8,4,6,5,9,6,3,6,5, %T A180310 4,5,8,2,2,9,0,7,5,3,3,7,6,3,9,0,1,3,2,0,5,0,6,1,3,3,5,4,3,6,8,2,7,3, %U A180310 3,8,2,2,0,6,9,2,9,2,2,1,8,5,9,3,1,0,6,9,9,0,5,4,1,0,3,3,8,4,6,3,4,2,4,9,1 %N A180310 Decimal expansion of Pi/2 - 4/Pi. %C A180310 Torsional rigidity constant for a half-disk shaped shaft. %H A180310 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A180310 Equals A019669 - A088538. %e A180310 0.29755678205973393308... %t A180310 RealDigits[-4/Pi+Pi/2,10,120][[1]] (* _Harvey P. Dale_, May 02 2012 *) %o A180310 (PARI) Pi/2 - 4/Pi \\ _Stefano Spezia_, May 26 2025 %Y A180310 Cf. A019669, A088538. %K A180310 nonn,cons %O A180310 0,1 %A A180310 _Eric W. Weisstein_, Aug 26 2010