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Search: id:A032911
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| A032911 |
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Numbers whose set of base 4 digits is {1,3}. |
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+0
1
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| 1, 3, 5, 7, 13, 15, 21, 23, 29, 31, 53, 55, 61, 63, 85, 87, 93, 95, 117, 119, 125, 127, 213, 215, 221, 223, 245, 247, 253, 255, 341, 343, 349, 351, 373, 375, 381, 383, 469, 471, 477, 479, 501, 503, 509, 511, 853, 855, 861, 863, 885
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Numbers that have ones in all even bit positions, counted from least significant bit as position 0. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Nov 01 2003
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FORMULA
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a(2n) = 4a(n) + 1, a(2n+1) = 4a(n) + 3. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Nov 01 2003
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EXAMPLE
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Sequence in binary: 1 11 101 111 1101 1111 10101 10111 11101 11111..
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CROSSREFS
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Sequence in context: A063241 A007591 A097687 this_sequence A157834 A008996 A031163
Adjacent sequences: A032908 A032909 A032910 this_sequence A032912 A032913 A032914
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KEYWORD
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nonn,base
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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