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Search: id:A108020
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| A108020 |
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Numbers n whose binary representation is 1100, n times. |
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+0
1
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| 0, 12, 204, 3276, 52428, 838860, 13421772, 214748364, 3435973836, 54975581388, 879609302220, 14073748835532, 225179981368524, 3602879701896396, 57646075230342348, 922337203685477580, 14757395258967641292
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Numbers whose base 16 representation consists entirely of 12's; 12 times base 16 repunits. - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Mar 29 2006
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FORMULA
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a(n) = (16^n-1)/15*12. - Frank Adams-Watters (FrankTAW(AT)Netscape.net), Mar 29 2006
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EXAMPLE
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a(3)=3276 because 3276 translated in base 2 is three times 1100: 110011001100.
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MATHEMATICA
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Table[ FromDigits[ Flatten[ Table[{1, 1, 0, 0}, {i, n}]], 2], {n, 0, 16}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 01 2005)
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CROSSREFS
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Sequence in context: A141836 A083932 A080316 this_sequence A097193 A051688 A151590
Adjacent sequences: A108017 A108018 A108019 this_sequence A108021 A108022 A108023
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KEYWORD
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easy,nonn
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AUTHOR
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Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), May 31 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 01 2005
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