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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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1
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3, 6, 12, 24, 48, 816, 16212, 212424, 424848, 84816816, 1681621216212, 21216212424212424, 424212424848424848, 8484248481681684816816, 1681684816816212162121681621216212, 21216212168162121621242421242421216212424212424
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OFFSET
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1,1
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LINKS
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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]] (* Robert G. Wilson v, Feb 21 2005 *)
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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