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Search: id:A147538
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| A147538 |
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Numbers whose binary representation is the concatenation of n 1's and 2n-1 digits 0. |
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+0
6
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| 2, 24, 224, 1920, 15872, 129024, 1040384, 8355840, 66977792, 536346624, 4292870144, 34351349760, 274844352512, 2198889037824, 17591649173504, 140735340871680, 1125891316908032, 9007164895002624, 72057456598974464
(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 A138119(n).
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FORMULA
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a(n)=2^(2n-1)*(2^n-1) = A081294(n)*A000225(n). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 09 2008]
a(n)=A016152(n)*2. [From Omar E. Pol (info(AT)polprimos.com), Nov 13 2008]
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MATHEMATICA
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Table[FromDigits[Join[Table[1, {n}], Table[0, {2n - 1}]], 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. A138119.
Cf. A016152. [From Omar E. Pol (info(AT)polprimos.com), Nov 13 2008]
Sequence in context: A121356 A052780 A121213 this_sequence A025131 A143407 A132596
Adjacent sequences: A147535 A147536 A147537 this_sequence A147539 A147540 A147541
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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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