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A138342
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First differences of A007088.
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2
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1, 9, 1, 89, 1, 9, 1, 889, 1, 9, 1, 89, 1, 9, 1, 8889, 1, 9, 1, 89, 1, 9, 1, 889, 1, 9, 1, 89, 1, 9, 1, 88889, 1, 9, 1, 89, 1, 9, 1, 889, 1, 9, 1, 89, 1, 9, 1, 8889, 1, 9, 1, 89, 1, 9, 1, 889, 1, 9, 1, 89, 1, 9, 1, 888889, 1, 9, 1, 89, 1, 9, 1, 889, 1, 9, 1, 89, 1, 9, 1, 8889, 1, 9, 1, 89, 1, 9
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OFFSET
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1,2
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LINKS
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FORMULA
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Multiplicative with a(2^e) = A059482(e), a(p^e) = 1 for odd primes p.
(End)
G.f.: Sum_{k>=0} 10^k * x^(2^k) / (1 + x^(2^k)). - Ilya Gutkovskiy, Dec 14 2020
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EXAMPLE
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1-0 = 1, 10-1 = 9, 11-10 = 1, 100-11 = 89, ...
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MATHEMATICA
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Differences[Table[FromDigits[IntegerDigits[n, 2]], {n, 0, 90}]] (* Harvey P. Dale, Feb 26 2012 *)
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PROG
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(PARI)
(PARI)
A059482(n) = ((10^n)*(1000/1125) + (1/9));
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CROSSREFS
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KEYWORD
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nonn,mult
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AUTHOR
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Jaume Simon Gispert (jaume(AT)nuem.com), May 17 2008
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EXTENSIONS
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STATUS
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approved
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