Search: id:A035214
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%I A035214
%S A035214 2,2,1,2,1,1,2,1,1,1,2,1,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,
%T A035214 1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,
%U A035214 2,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1
%N A035214 2 followed by a run of n 1's.
%F A035214 a(n) = 2 if n is a triangular number, otherwise 1.
%F A035214 a(n) = floor((3-cos(Pi*sqrt(8*n+1)))/2) - Carl R. White (oeisfan(AT)cyreksoft.yorks.com), 
               Mar 18 2006
%Y A035214 Cf. A035253, A035254.
%Y A035214 A010054(n) + 1.
%Y A035214 Sequence in context: A029441 A109495 A164295 this_sequence A071292 A088569 
               A001285
%Y A035214 Adjacent sequences: A035211 A035212 A035213 this_sequence A035215 A035216 
               A035217
%K A035214 nonn
%O A035214 0,1
%A A035214 N. J. A. Sloane (njas(AT)research.att.com).
%E A035214 Typo corrected by Neven Juric, Jan 10 2009

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