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 A296041 #5 Feb 16 2025 08:33:52 %S A296041 1,8,6,4,4,5,8,9,5,8,1,6,3,4,8,8,1,3,2,3,5,2,0,0,3,7,1,5,2,7,3,9,4,3, %T A296041 7,8,4,1,5,6,4,2,2,0,6,9,8,2,6,6,4,9,9,2,3,5,8,6,9,0,4,3,8,1,8,2,7,5, %U A296041 3,2,5,7,3,5,8,3,4,5,5,8,1,7,7,9,9,6,4,4,9,0,6,1,9,8,3,7,8,2,2,2 %N A296041 Decimal expansion of sqrt(1 + sqrt(3 + sqrt(6 + sqrt(10 + sqrt(15 + ... + sqrt(k*(k + 1)/2 + ...)))))). %H A296041 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/NestedRadical.html">Nested Radical</a> %e A296041 1.86445895816348813235200371527394378415642206982664... %Y A296041 Cf. A000217, A072449, A099876, A099879, A105546, A105817, A239349, A257574, A257575, A257576, A257577, A257578. %K A296041 nonn,cons %O A296041 1,2 %A A296041 _Ilya Gutkovskiy_, Dec 03 2017