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A108882
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Period doubling sequence starting with '1 0 1'.
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0
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1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 1
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OFFSET
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1,1
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COMMENTS
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Start with S = 1,0,1; replace S by SS and complement the last bit; iterate.
Similar to A035263 but with a different start.
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LINKS
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Table of n, a(n) for n=1..105.
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MATHEMATICA
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f[l_] := Block[{s = Flatten[{l, l}]}, s[[ -1]] = Mod[s[[ -1]] + 1, 2]; s]; Nest[f, {1, 0, 1}, 6] (* Robert G. Wilson v, Jul 16 2005 *)
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PROG
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s=[1 0 1]; loop s=concat(s, s); s(length(s))=(s(length(s))+1)modulo2 endloop
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CROSSREFS
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Cf. A035263.
Sequence in context: A141212 A341347 A137893 * A284656 A168002 A267050
Adjacent sequences: A108879 A108880 A108881 * A108883 A108884 A108885
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KEYWORD
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easy,nonn
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AUTHOR
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Alexandre Losev, Jul 14 2005
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EXTENSIONS
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More terms from Robert G. Wilson v, Jul 16 2005
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STATUS
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approved
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