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A032810
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Numbers using only digits 2 and 3.
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3
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2, 3, 22, 23, 32, 33, 222, 223, 232, 233, 322, 323, 332, 333, 2222, 2223, 2232, 2233, 2322, 2323, 2332, 2333, 3222, 3223, 3232, 3233, 3322, 3323, 3332, 3333, 22222, 22223, 22232, 22233, 22322, 22323, 22332, 22333, 23222, 23223
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n) = f(n+1, 0) with f(n, x) = if n=1 then A004086(x) else f(floor(n/2), 10*x + 2 + n mod 2). [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 06 2008]
a(n) is Theta(n^(log_2 10)); there are about n^(log_10 2) members of this sequence up to n.
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CROSSREFS
| A020458, A143967. [From Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Sep 06 2008]
Sequence in context: A084797 A163902 A154865 * A062921 A083178 A154254
Adjacent sequences: A032807 A032808 A032809 * A032811 A032812 A032813
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KEYWORD
| nonn,base,easy
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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EXTENSIONS
| Formula from Charles R Greathouse IV (charles.greathouse(AT)case.edu), Mar 18 2010
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