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 A140247 #14 Feb 16 2025 08:33:08 %S A140247 2,0,6,5,5,9,1,1,1,7,9,7,7,2,8,9,0,0,5,4,2,8,9,4,1,5,4,6,5,5,0,6,1,3, %T A140247 1,2,5,7,7,7,5,5,8,2,4,2,8,2,2,1,8,1,7,7,4,1,8,0,0,3,9,3,4,1,9,2,7,1, %U A140247 9,0,9,8,2,3,6,6,3,8,8,8,1,7,8,7,6,9,5,3,2,6,7,6,5,7,9,5,9,2,0,9,5,5,5,3,6 %N A140247 Decimal expansion of 8/sqrt(15). %C A140247 Circumradius 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. %H A140247 Daniel Starodubtsev, <a href="/A140247/b140247.txt">Table of n, a(n) for n = 1..10000</a> %H A140247 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Circumradius.html">Circumradius</a>. %H A140247 <a href="/index/Al#algebraic_02">Index entries for algebraic numbers, degree 2</a> %F A140247 8/sqrt(15) = 8/A010472. %e A140247 2.06559111797728900542894154655061312577755824282218177418003934192719098236... %t A140247 RealDigits[8/Sqrt[15],10,120][[1]] (* _Harvey P. Dale_, May 06 2012 *) %o A140247 (PARI) 8/sqrt(15) %Y A140247 Cf. A140239, A140240, A140241, A140242, A140243, A140244, A140245, A140246, A140248, A140249, A088543, A010472. %Y A140247 Equals sqrt(A331227(10)/A331228(10)) = sqrt(A331227(11)/A331228(11)), A331254, A331255, A331256 (list of triangles with integer sides sorted by circumradius). %K A140247 cons,nonn %O A140247 1,1 %A A140247 _Rick L. Shepherd_, May 14 2008