%I
%S 0,23,36,52,71,80,104,137,143,154,377,443,479,533,823,963,977,1013,
%T 1125,1204,1284,1334,1493,1624,1769,1786,1997,2047,2110,2228,2260,
%U 2427,2508,2577,2707,2740,3121,3174,3223,3407,3440,3477,3526,3644,3745,3828,3860,4027,4079,4163,4314,4384,4518
%N Numbers k such that A258881(k) is a square.
%H Robert Israel, <a href="/A329179/b329179.txt">Table of n, a(n) for n = 1..10000</a>
%e a(3) = 36 is a member of the sequence because 36 + 3^2 + 6^2 = 81 = 9^2.
%p filter:= n > issqr(n + convert(map(`^`,convert(n,base,10),2),`+`)):
%p select(filter, [$0..10^4]);
%Y Cf. A258881.
%K nonn
%O 1,2
%A _Will Gosnell_ and _Robert Israel_, Nov 07 2019
