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%I #15 Jul 11 2020 07:36:27
%S 1,4,4,0,4,10,8,8,4,12,24,0,0,16,8,16,4,8,20,0,10,16,24,8,8,44,8,0,8,
%T 16,40,16,4,16,24,0,12,32,8,16,24,16,16,0,0,50,40,8,0,28,44,0,16,16,
%U 32,40,8,32,40,0,16,32,16,24,4,48,16,0,8,16,80,16,20,40,24,0,0,16,32,32,10,36
%N Number of solutions to a^2 + b^2 + 5*c^2 = n.
%C a(n) = 0 for n of the form 4^i*(8*j+3), A055046. [_Zak Seidov_, May 12 2010]
%H Zak Seidov, <a href="/A169784/b169784.txt">Table of n,a(n) for n=0..1000</a>
%F G.f.: theta_3(q)^2*theta_3(q^5), where theta_3() is the Jacobi theta function. - _Ilya Gutkovskiy_, Aug 01 2018
%Y x^2+y^2+k*z^2: A005875, A014455, A034933, A169783.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, May 12 2010
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