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 A337440 #21 Feb 13 2024 11:31:29 %S A337440 5,3,9,0,1,2,0,8,4,4,5,2,6,4,7,2,2,1,3,5,6,1,6,8,1,6,9,7,1,7,1,2,1,2, %T A337440 5,5,3,6,2,2,6,4,8,1,9,3,7,3,9,3,7,0,1,6,7,5,4,0,4,2,5,6,3,0,1,0,5,7, %U A337440 9,6,3,2,6,5,9,6,7,9,1,7,4,7,3,3,4,5 %N A337440 Decimal expansion of Pi*(3 - 2*sqrt(2)). %C A337440 This is the area of the largest semicircle that can be inscribed in the unit square. %H A337440 Nick Hobson, <a href="https://web.archive.org/web/20160416130617/http://www.qbyte.org/puzzles/p153s.html">Solution to puzzle 153: Semicircle in a square</a>, 2007. %H A337440 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %F A337440 Equals A000796*(3 - A010466) = A000796*(A157259 - 4). - _Omar E. Pol_, Sep 06 2020 %e A337440 0.53901208445264722135616816971712125536226481937393701675404256301... %t A337440 RealDigits[Pi*[3-Sqrt[8]], 10, 120][[1]] (* _Omar E. Pol_, Sep 06 2020 *) %o A337440 (PARI) Pi*(3-2*sqrt(2)) %Y A337440 Cf. A000796, A010466, A157259. %K A337440 nonn,cons %O A337440 0,1 %A A337440 _Hugo Pfoertner_, Sep 06 2020