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%I #16 Jan 10 2025 04:35:23
%S 0,1,1,1,2,2,2,3,3,3,3,3,3,4,4,4,5,5,5,6,6,6,6,6,6,7,7,7,8,8,8,9,9,9,
%T 9,9,9,10,10,10,10,10,10,11,11,11,11,11,11,11,11,11,12,12,12,12,12,12,
%U 12,12,12,13,13,13,14,14,14,15,15,15,15,15,15,16,16
%N Partial sums of A070563.
%H Amiram Eldar, <a href="/A070564/b070564.txt">Table of n, a(n) for n = 0..10000</a>
%H Pieter Moree and Herman J.J. te Riele, <a href="https://doi.org/10.1090/S0025-5718-03-01556-4">The hexagonal versus the square lattice</a>, Math. Comp., Vol. 73, No. 245 (2004), 451-473.
%t Accumulate[Table[Boole[!Divisible[RamanujanTau[n], 3]], {n, 0 ,100}]] (* _Amiram Eldar_, Jan 10 2025 *)
%Y Cf. A000594, A070563.
%K nonn
%O 0,5
%A _N. J. A. Sloane_, May 07 2002