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Search: id:A102260
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| A102260 |
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Begin with 5, multiply each digit by 2, keeping the memory of the groupings of the preceding digits. |
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+0
1
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| 5, 10, 20, 40, 80, 160, 2120, 4240, 8480, 168160, 212162120, 4242124240, 8484248480, 16816848168160, 2121621216816212162120, 424212424212162124242124240, 8484248484242124248484248480
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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Apply the rule "d*2", beginning with 5
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EXAMPLE
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Read a(5)=80 which produces a(6)=160 because 8*2=16 and 0*2=0.
Now read a(6)=160 which produces a(7)=2120 because 1*2=2, 6*2=12 and 0*2=0.
Read a(10)=168160 which produces the digits of a(11)=212162 AND the first three digits of a(12)=1204242 because 1*2=2, 6*2=12, 8*2=16, 1*2=2 AND 6*2=12 and 0*2=0
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MATHEMATICA
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Flatten[ NestList[ Function[x, FromDigits[ Flatten[ IntegerDigits[2IntegerDigits[ x]]] ]], 5, 16]] (from Robert G. Wilson v Feb 21 2005)
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CROSSREFS
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Sequence in context: A107486 A146523 A020714 this_sequence A023383 A092407 A056496
Adjacent sequences: A102257 A102258 A102259 this_sequence A102261 A102262 A102263
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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 19 2005
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 21 2005
Edited by njas, Sep 06 2008 at the suggestion of R. J. Mathar
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