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 A386411 #9 Jul 21 2025 11:41:22 %S A386411 3,8,8,9,0,8,7,2,9,6,5,2,6,0,1,1,3,8,4,2,0,4,6,4,3,9,9,1,5,7,6,6,6,9, %T A386411 7,1,6,0,6,6,5,9,7,6,5,7,2,8,6,6,0,7,2,0,1,2,3,5,8,6,9,2,7,9,4,7,4,5, %U A386411 1,4,3,1,5,7,7,0,7,9,4,3,5,6,8,3,8,5,6,5,7,1 %N A386411 Decimal expansion of the volume of an augmented truncated tetrahedron with unit edge. %C A386411 The augmented truncated tetrahedron is Johnson solid J_65. %H A386411 Paolo Xausa, <a href="/A386411/b386411.txt">Table of n, a(n) for n = 1..10000</a> %H A386411 Wikipedia, <a href="https://en.wikipedia.org/wiki/Augmented_truncated_tetrahedron">Augmented truncated tetrahedron</a>. %F A386411 Equals 11/(2*sqrt(2)) = 11/A010466. %F A386411 Equals A377275 + 10*A020829. %F A386411 Equals the largest root of 8*x^2 - 121. %e A386411 3.889087296526011384204643991576669716066597657... %t A386411 First[RealDigits[11/Sqrt[8], 10, 100]] (* or *) %t A386411 First[RealDigits[PolyhedronData["J65", "Volume"], 10, 100]] %Y A386411 Cf. A386412 (surface area). %Y A386411 Cf. A010466, A020829, A377275. %K A386411 nonn,cons,easy %O A386411 1,1 %A A386411 _Paolo Xausa_, Jul 21 2025