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Search: id:A102254
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| A102254 |
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Begin with 3, multiply each digit by 2, keeping the memory of the groupings of the preceding digits. |
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+0
2
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| 3, 6, 12, 24, 48, 816, 16212, 212424, 424848, 84816816, 1681621216212, 21216212424212424, 424212424848424848, 8484248481681684816816, 1681684816816212162121681621216212, 21216212168162121621242421242421216212424212424
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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d*2, beginning with 3
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EXAMPLE
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Read a(3)=12 which produces a(4)=24 because 1*2=2 and 2*2=4.
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MATHEMATICA
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Flatten[ NestList[ Function[x, FromDigits[ Flatten[ IntegerDigits[2IntegerDigits[ x]]] ]], 3, 15]] (from Robert G. Wilson v Feb 21 2005)
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CROSSREFS
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Adjacent sequences: A102251 A102252 A102253 this_sequence A102255 A102256 A102257
Sequence in context: A049942 A099844 A084717 this_sequence A007239 A088970 A068425
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KEYWORD
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base,easy,nonn
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AUTHOR
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Alexandre Wajnberg & Eric Angelini (alexandre.wajnberg(AT)ulb.ac.be), Feb 18 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 21 2005
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