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 A120731 #19 Sep 08 2022 08:45:26 %S A120731 3,1,4,1,4,2,1,3,5,6,2,3,7,3,0,9,5,0,4,8,8,0,1,6,8,8,7,2,4,2,0,9,6,9, %T A120731 8,0,7,8,5,6,9,6,7,1,8,7,5,3,7,6,9,4,8,0,7,3,1,7,6,6,7,9,7,3,7,9,9,0, %U A120731 7,3,2,4,7,8,4,6,2,1,0,7,0,3,8,8,5,0,3,8,7,5,3,4,3,2,7,6,4,1,5,7 %N A120731 Decimal expansion of 3 + sqrt(2)/10. %C A120731 Said to be Dante Alighieri's approximation to Pi. %D A120731 Jörg Arndt and Christoph Haenel, Pi Unleashed, New York: Springer (2001), p. 56. %H A120731 G. C. Greubel, <a href="/A120731/b120731.txt">Table of n, a(n) for n = 1..10000</a> %H A120731 D. Castellanos, <a href="http://www.jstor.org/stable/2690037">The ubiquitous pi</a>, Math. Mag., 61 (1988), 67-98 and 148-163. [_N. J. A. Sloane_, Mar 24 2012] %e A120731 3 + sqrt(2)/10 = 3.141421356237309504880168872..., which differs from Pi by 0.00017129735248373485... %t A120731 RealDigits[3 + Sqrt[2]/10, 10, 100][[1]] (* _G. C. Greubel_, Sep 27 2018 *) %o A120731 (PARI) default(realprecision, 100); 3 + sqrt(2)/10 \\ _G. C. Greubel_, Sep 27 2018 %o A120731 (Magma) SetDefaultRealField(RealField(100)); 3 + Sqrt(2)/10; // _G. C. Greubel_, Sep 27 2018 %Y A120731 Essentially the same sequence as A002193 (sqrt(2)). %Y A120731 Cf. A000796 (Pi). %K A120731 nonn,cons,easy %O A120731 1,1 %A A120731 _Zak Seidov_, Aug 18 2006