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Search: id:A092539
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| A092539 |
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Binary representation of a(n) equals first n terms of A051023. |
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+0
5
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| 1, 3, 6, 13, 27, 55, 110, 220, 441, 883, 1766, 3532, 7064, 14129, 28258, 56517, 113035, 226070, 452140, 904281, 1808562, 3617124, 7234249, 14468499, 28936999, 57873998, 115747997, 231495994, 462991989, 925983979, 1851967959, 3703935918
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(n+1) = 2*a(n) + d, where d = 0/1 with no obvious rule. The sequence is a digit representation of the central column of cellular automaton Rule 30, A051023. Primes in the sequence, A092540.
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LINKS
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Eric Weisstein's World of Mathematics, Rule 30.
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FORMULA
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a(n)=FromDigits[Take[A051023, n], 2]
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EXAMPLE
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a(6) = 55_10 = 110111_2
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MATHEMATICA
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a(n_) := FromDigits[Take[A051023, n], 2]
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CROSSREFS
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Cf. A051023, A092540.
Adjacent sequences: A092536 A092537 A092538 this_sequence A092540 A092541 A092542
Sequence in context: A079403 A065830 A055143 this_sequence A094386 A099036 A131246
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KEYWORD
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easy,nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Feb 27 2004
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