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A052223
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Numbers whose sum of digits is 9.
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36
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9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 108, 117, 126, 135, 144, 153, 162, 171, 180, 207, 216, 225, 234, 243, 252, 261, 270, 306, 315, 324, 333, 342, 351, 360, 405, 414, 423, 432, 441, 450, 504, 513, 522, 531, 540, 603, 612, 621, 630, 702, 711, 720, 801, 810
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OFFSET
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1,1
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COMMENTS
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Any term of this sequence with an 11 appended cannot have 11 as prime factor. See A075154. [Lekraj Beedassy, Sep 27 2009]
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LINKS
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MATHEMATICA
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Select[Range[1500], Total[IntegerDigits[#]] == 9 &] (* Vincenzo Librandi, Mar 08 2013 *)
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PROG
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(Haskell)
a052223 n = a052223_list !! (n-1)
a052223_list = filter ((== 9) . a007953) [0..]
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CROSSREFS
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Cf. A011557 (1), A052216 (2), A052217 (3), A052218 (4), A052219 (5), A052220 (6), A052221 (7), A052222 (8), A052224 (10), A166311 (11), A235151 (12), A143164 (13), A235225(14), A235226 (15), A235227 (16), A166370 (17), A235228 (18), A166459 (19), A235229 (20).
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KEYWORD
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nonn,base,easy
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AUTHOR
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EXTENSIONS
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More terms from Larry Reeves (Larryr(AT)acm.org), Sep 05 2000
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STATUS
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approved
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