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Search: id:A147539
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| A147539 |
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Numbers whose binary representation is the concatenation of n 1's, 2n-1 digits 0 and n 1's. |
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+0
6
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| 5, 99, 1799, 30735, 507935, 8257599, 133169279, 2139095295, 34292630015, 549218943999, 8791798056959, 140703128621055, 2251524935786495, 36026597995724799, 576443160117411839, 9223231299366486015
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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a(n) is the number whose binary representation is A138120(n).
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FORMULA
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a(n) = 2^n-1+2^(4n-1)-2^(3n-1). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 09 2008]
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MATHEMATICA
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Table[FromDigits[Join[Table[1, {n}], Table[0, {2n - 1}], Table[1, {n}]], 2], {n, 1, 20}] [From Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Nov 11 2008]
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CROSSREFS
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Cf. A138120.
Sequence in context: A053980 A088995 A093749 this_sequence A156276 A128784 A078534
Adjacent sequences: A147536 A147537 A147538 this_sequence A147540 A147541 A147542
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KEYWORD
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base,easy,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Nov 06 2008
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EXTENSIONS
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Extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), Nov 09 2008
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