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A139280
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a(n) = 90*n - 81.
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18
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9, 99, 189, 279, 369, 459, 549, 639, 729, 819, 909, 999, 1089, 1179, 1269, 1359, 1449, 1539, 1629, 1719, 1809, 1899, 1989, 2079, 2169, 2259, 2349, 2439, 2529, 2619, 2709, 2799, 2889, 2979, 3069, 3159, 3249, 3339, 3429, 3519, 3609, 3699, 3789, 3879, 3969
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OFFSET
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1,1
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COMMENTS
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Multiples of 9 with final digit 9.
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LINKS
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FORMULA
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a(n) = a(n-1) + 90.
G.f.: 9*(19*x-9)/(x-1)^2.
E.g.f.: 9*(10*x - 9)*exp(x). (End) [G.f. corrected by Georg Fischer, May 12 2019]
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MATHEMATICA
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PROG
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(PARI) for(n=1, 1e2, a=90*n-81; print1(a, ", ")) \\ Felix Fröhlich, Jul 07 2014
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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