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A163450
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A028403(n) written in base 2.
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1
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100, 1100, 101000, 10010000, 1000100000, 100001000000, 10000010000000, 1000000100000000, 100000001000000000, 10000000010000000000, 1000000000100000000000, 100000000001000000000000, 10000000000010000000000000, 1000000000000100000000000000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The digit pattern is (for n>1): one 1, (n-2) times 0, one 1, and n times 0.
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FORMULA
| a(n) = 10^(2n-1) + 10^n, for n >= 2.
a(n) = 110*a(n-1) -1000*a(n-2), n>3.
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CROSSREFS
| Sequence in context: A025421 A124166 A103175 * A129725 A167043 A203283
Adjacent sequences: A163447 A163448 A163449 * A163451 A163452 A163453
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KEYWORD
| nonn,easy,base
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AUTHOR
| Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Jul 27 2009
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EXTENSIONS
| Recurrence added by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 21 2009
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