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Search: id:A108019
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| 0, 4, 36, 292, 2340, 18724, 149796, 1198372, 9586980, 76695844, 613566756, 4908534052, 39268272420, 314146179364, 2513169434916, 20105355479332, 160842843834660, 1286742750677284, 10293942005418276, 82351536043346212
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Numbers n whose binary representation is 100, n times.
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EXAMPLE
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a(3)=292 because 292 translated in base 2 is three times 100: 100100100.
Octal...............decimal (comment from Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jan 14 2007):
0......................0
4......................4
44....................36
444..................292
4444................2340
44444..............18724
444444............149796
4444444..........1198372
44444444.........9586980
444444444.......76695844
4444444444.....613566756
etc. ...............etc.
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MATHEMATICA
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Table[ FromDigits[ Flatten[ Table[{1, 0, 0}, {i, n}]], 2], {n, 0, 19}] (from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 01 2005)
s=0; lst={s}; Do[s+=2^n; AppendTo[lst, s], {n, 2, 5!, 3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 07 2008]
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PROGRAM
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(PARI) a(n)=if(n<0, 0, (8^n-1)*4/7) (Michael Somos)
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CROSSREFS
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Sequence in context: A144889 A098916 A059416 this_sequence A093186 A000765 A026334
Adjacent sequences: A108016 A108017 A108018 this_sequence A108020 A108021 A108022
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KEYWORD
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easy,nonn,new
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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
simplify! [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 07 2008]
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