%I #4 Dec 03 2017 13:41:11
%S 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 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 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 Decimal expansion of sqrt(1 + sqrt(3 + sqrt(6 + sqrt(10 + sqrt(15 + ... + sqrt(k*(k + 1)/2 + ...)))))).
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/NestedRadical.html">Nested Radical</a>
%e 1.86445895816348813235200371527394378415642206982664...
%Y Cf. A000217, A072449, A099876, A099879, A105546, A105817, A239349, A257574, A257575, A257576, A257577, A257578.
%K nonn,cons
%O 1,2
%A _Ilya Gutkovskiy_, Dec 03 2017
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