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 A052223 Numbers whose sum of digits is 9. 32
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Any term of this sequence with an 11 appended cannot have 11 as prime factor. See A075154. [Lekraj Beedassy, Sep 27 2009] A007953(a(n)) = 9; number of repdigits = #{9,333,1^9} = A242627(9) = 3. - Reinhard Zumkeller, Jul 17 2014 A010872(a(n)) = A010878(a(n)) = 0. - Ilya Gutkovskiy, Jun 04 2016 LINKS Vincenzo Librandi and Alois P. Heinz, Table of n, a(n) for n = 1..10000 (first 1000 terms from Vincenzo Librandi) MATHEMATICA Select[Range[1500], Total[IntegerDigits[#]] == 9 &] (* Vincenzo Librandi, Mar 08 2013 *) PROG (MAGMA) [n: n in [1..1500] | &+Intseq(n) eq 9 ]; // Vincenzo Librandi, Mar 08 2013 (Haskell) a052223 n = a052223_list !! (n-1) a052223_list = filter ((== 9) . a007953) [0..] -- Reinhard Zumkeller, Jul 17 2014 CROSSREFS Cf. A007953. Row n=9 of A245062. 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). Sequence in context: A259729 A016096 A070793 * A085132 A111708 A248050 Adjacent sequences:  A052220 A052221 A052222 * A052224 A052225 A052226 KEYWORD nonn,base,easy AUTHOR Henry Bottomley, Feb 01 2000 EXTENSIONS More terms from Larry Reeves (Larryr(AT)acm.org), Sep 05 2000 Offset changed by Bruno Berselli, Mar 07 2013 STATUS approved

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Last modified October 18 20:28 EDT 2019. Contains 328197 sequences. (Running on oeis4.)