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%I #9 Mar 30 2012 17:33:49
%S 1,1,1,1,1,1,1,1,1,1,1,1,1,0,1,1,1,1,1,1,0,1,1,1,0,1,1,1,1,0,1,1,0,1,
%T 1,1,1,0,1,1,0,1,0,1,1,1,1,0,1,0,1,1,0,1,1,0,1,1,0,1,0,1,1,1,0,1,0,1,
%U 1,0,1,0,1,1,1,0,0,1
%N Characteristic function of the Riemann zeta function: If n is a nearest integer to imaginary part of zero, then a(n)=0 else a(n)=1.
%C Also an interesting triangle read by row: See tabl.
%H <a href="/index/Ch#char_fns">Index entries for characteristic functions</a>
%H <a href="/index/Z#zeta_function">Index entries for zeta function</a>.
%e a(30)=0 because 30 is the nearest integer to imaginary part of 4th nontrivial zero of Riemann zeta function.
%Y See A002410 for more information. Cf. A058303, A065434, A065452, A065453.
%K easy,nonn,tabl
%O 1,1
%A _Omar E. Pol_, Sep 13 2007
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