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Search: id:A153034
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| A153034 |
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Numbers with adjacent 0's and no adjacent 1's in binary expansion. |
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+0
1
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| 4, 8, 9, 16, 17, 18, 20, 32, 33, 34, 36, 37, 40, 41, 64, 65, 66, 68, 69, 72, 73, 74, 80, 81, 82, 84, 128, 129, 130, 132, 133, 136, 137, 138, 144, 145, 146, 148, 149, 160, 161, 162, 164, 165, 168, 169, 256, 257, 258, 260, 261, 264, 265, 266, 272, 273, 274, 276, 277
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(1)=4 becuase bin(4)=100.
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MATHEMATICA
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fQ[n_] := Block[{st = Union@Split@IntegerDigits[n, 2]}, MemberQ[st, {0, __}] && !MemberQ[st, {1, __}]]; Select[Range@ 288, fQ@# &] [From Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 21 2008]
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CROSSREFS
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Cf. A153033, A000975. [From Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 21 2008]
Sequence in context: A018196 A072103 A004756 this_sequence A106840 A140612 A160053
Adjacent sequences: A153031 A153032 A153033 this_sequence A153035 A153036 A153037
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KEYWORD
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base,easy,nonn
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AUTHOR
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Gil Broussard (gilbroussard(AT)bellsouth.net), Dec 17 2008
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EXTENSIONS
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I added the Mathematica coding, extended the sequence and added the cross-references. Robert G. Wilson v (rgwv(AT)rgwv.com), Dec 21 2008
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