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Partial sums of A070563.
2

%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