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%I #24 Jan 16 2019 11:53:44
%S 0,0,1,0,0,0,1,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,1,0,0,0,1,0,0,0,1,0,0,1,
%T 0,0,0,1,0,1,0,0,0,1,0,0,1,0,0,0,1,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,1,0,
%U 0,0,1,0,0,0,1,0,0,1,0,0,0,1,0,1,0,0,0,1,0,0,1,0,0,0,1,0,1,0,0,0
%N Indicator function for A003145.
%C a(n) = 1 iff n is a member of A003145.
%C a(n+1) = 1 iff n is a member of A278040, for n >= 0. - _Wolfdieter Lang_, Dec 06 2018
%H N. J. A. Sloane, <a href="/A276794/b276794.txt">Table of n, a(n) for n = 0..10000</a>
%H Wolfdieter Lang, <a href="https://arxiv.org/abs/1810.09787">The Tribonacci and ABC Representations of Numbers are Equivalent</a>, arXiv preprint arXiv:1810.09787 [math.NT], 2018.
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%F a(n+1) = t(n)*(2 - t(n)), where t(n) = A080843(n), for n >= 0; and a(0) = 0. - _Wolfdieter Lang_, Dec 06 2018
%Y Cf. A003145, A080843, A276797, A278040.
%Y A276793(n)+A276794(n)+A276791(n)=1; A276796(n)+A276797(n)+A276798(n)=n+1.
%K nonn,easy
%O 0
%A _N. J. A. Sloane_, Oct 28 2016
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