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 A140248 #16 Feb 16 2025 08:33:08 %S A140248 1,1,6,1,8,9,5,0,0,3,8,6,2,2,2,5,0,6,5,5,5,3,7,7,9,6,1,9,9,3,4,7,1,9, %T A140248 8,8,3,2,4,9,8,7,6,5,1,1,5,8,7,4,7,7,2,4,7,9,7,6,2,7,2,1,2,9,8,3,4,0, %U A140248 4,4,9,2,7,5,8,1,0,9,3,7,1,0,0,5,5,7,8,6,2,1,3,0,5,7,6,0,2,0,5,5,3,7,4,8,9 %N A140248 Decimal expansion of 0.3 * sqrt(15). %C A140248 Exradius opposite the side of length 2 of the obtuse scalene triangle with sides of lengths 2, 3 and 4, the scalene triangle with least integer side lengths. See formulas in the Weisstein link. %C A140248 Multiplied by 10, this is sqrt(135). - _Alonso del Arte_, Jan 06 2013 %H A140248 Daniel Starodubtsev, <a href="/A140248/b140248.txt">Table of n, a(n) for n = 1..10000</a> %H A140248 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Exradius.html">Exradius</a>. %H A140248 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a> %F A140248 0.3*sqrt(15) = 0.3*A010472 = 0.4*A140239 = 0.6*A088543 = 0.2*A140249. %e A140248 1.16189500386222506555377961993471988324987651158747724797627212983404492758... %t A140248 RealDigits[(3/10)Sqrt[15], 10, 105][[1]] (* _Alonso del Arte_, Jan 06 2013 *) %o A140248 (PARI) 0.3*sqrt(15) %Y A140248 Cf. A140239, A140240, A140241, A140242, A140243, A140244, A140245, A140246, A140247, A140249, A088543, A010472. %K A140248 cons,nonn %O A140248 1,3 %A A140248 _Rick L. Shepherd_, May 14 2008