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A329179 Numbers k such that A258881(k) is a square. 2

%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

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)