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Search: id:A110240
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| A110240 |
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Decimal form of binary integers produced by a black cell at n-th generation following Wolfram's rule 30 cellular automata. |
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+0
1
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| 1, 7, 25, 111, 401, 1783, 6409, 28479, 102849, 456263, 1641433, 7287855, 26332369, 116815671, 420186569, 1865727615, 6741246849, 29904391303, 107568396185, 477630335215, 1725755276049, 7655529137527, 27537575631497
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Same definition as A074890 but different sequence. Why?
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LINKS
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Eric Weisstein's World of Mathematics, Rule 30.
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EXAMPLE
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a(1)=1 because the automate begins at first "generation" with one black cell: 1;
a(2)=5 because one black cell, through rule 30 at 2nd generation, produces three contiguous black cells: 111 (binary), so 7 (decimal);
a(3)=25 because the third generation is "black black white white black" cells: 11001, so 25 (decimal).
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CROSSREFS
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Cf. A070950, A051023, A092539, A092540, A070952, A100053, A100054, A100055, A094603, A094604, A000225, 074890.
Sequence in context: A138729 A035509 A102900 this_sequence A129791 A138292 A138738
Adjacent sequences: A110237 A110238 A110239 this_sequence A110241 A110242 A110243
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KEYWORD
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easy,nonn
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AUTHOR
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Alexandre Wajnberg & Eric Angelini (alexandre.wajnberg(AT)ulb.ac.be), Sep 06 2005
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EXTENSIONS
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More terms from Eric Weisstein (eric(AT)weisstein.com), Apr 08 2006
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