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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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5
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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; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| a(n) is the number whose binary representation is A138119(n).
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FORMULA
| 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
| 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
| Cf. A138119.
Cf. A016152. [From Omar E. Pol (info(AT)polprimos.com), Nov 13 2008]
Sequence in context: A189769 A174668 A121213 * A180388 A025131 A143407
Adjacent sequences: A147535 A147536 A147537 * A147539 A147540 A147541
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KEYWORD
| base,easy,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Nov 06 2008
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EXTENSIONS
| 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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