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A004647
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Powers of 2 written in base 8.
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0
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1, 2, 4, 10, 20, 40, 100, 200, 400, 1000, 2000, 4000, 10000, 20000, 40000, 100000, 200000, 400000, 1000000, 2000000, 4000000, 10000000, 20000000, 40000000, 100000000, 200000000, 400000000, 1000000000
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OFFSET
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0,2
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COMMENTS
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Or, numbers of form 10^n, 2*10^n, 4*10^n.
Or, numbers n such that the digits of n^3 are decreasing. - Dmitry Kamenetsky, Jun 15 2006
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LINKS
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Table of n, a(n) for n=0..27.
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FORMULA
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a(0)=1, a(1)=2, a(2)=4, a(n)=10*a(n-3). - Harvey P. Dale, Aug 16 2012
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MATHEMATICA
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Table[FromDigits[IntegerDigits[2^n, 8]], {n, 0, 30}] (* or *) LinearRecurrence[ {0, 0, 10}, {1, 2, 4}, 30] (* Harvey P. Dale, Aug 16 2012 *)
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CROSSREFS
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Sequence in context: A174175 A127392 A189585 * A167030 A026644 A167193
Adjacent sequences: A004644 A004645 A004646 * A004648 A004649 A004650
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KEYWORD
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nonn,base
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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