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Search: id:A007417
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| A007417 |
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If n appears, 3n does not.
(Formerly M0954)
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+0
6
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| 1, 2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 16, 17, 18, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 36, 37, 38, 40, 41, 43, 44, 45, 46, 47, 49, 50, 52, 53, 55, 56, 58, 59, 61, 62, 63, 64, 65, 67, 68, 70, 71, 72, 73
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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The characteristic function of this sequence is given by A014578. - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Mar 21 2004
Numbers n such that their ternary representation ends in even number of zeros . - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Mar 25 2004
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1000
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FORMULA
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Lim n -> infinity a(n)/n = 4/3 . - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Mar 21 2004
Partial sums of A092400. Indices of even numbers in A007949. Indices of odd numbers in A051064. a(n) = A092401(2n-1). - DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Mar 29 2004
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CROSSREFS
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Complement of A145204. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 04 2008]
Sequence in context: A039137 A071807 A074232 this_sequence A039099 A035257 A079726
Adjacent sequences: A007414 A007415 A007416 this_sequence A007418 A007419 A007420
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KEYWORD
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easy,nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
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More terms from DELEHAM Philippe (kolotoko(AT)wanadoo.fr), Mar 29 2004
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