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Partial alternating sums modulo 3 of the Kolakoski sequence A000002.
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%I #3 Feb 13 2019 22:09:40

%S 1,2,1,0,1,2,0,1,0,2,1,2,0,2,1,0,1,2,1,0,2,1,2,0,1,2,1,0,1,2,0,2,1,0,

%T 2,0,1,2,1,0,1,2,0,1,0,2,1,0,1,2,0,2,1,2,0,1,0,2,0,1,2,0,2,1,0,1,2,1,

%U 0,2,0,1,2,0,2,1,0,2,0,1,0,2,1,2,0,2,1,0,2,0,1,2,1,0,1,2,0,2,1,2,0,1,2,1,0,2

%N Partial alternating sums modulo 3 of the Kolakoski sequence A000002.

%C A074272 modulo 3.

%Y Cf. A000002, A074272.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Feb 13 2019, following a suggestion from Hannibal Fortune.