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A235228
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Numbers whose sum of digits is 18.
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31
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99, 189, 198, 279, 288, 297, 369, 378, 387, 396, 459, 468, 477, 486, 495, 549, 558, 567, 576, 585, 594, 639, 648, 657, 666, 675, 684, 693, 729, 738, 747, 756, 765, 774, 783, 792, 819, 828, 837, 846, 855, 864, 873, 882, 891, 909, 918, 927, 936, 945, 954, 963
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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A007953(a(n)) = 18; number of repdigits = #{99,666,333333,222222222,1^18} = A242627(18) = 5. - Reinhard Zumkeller, Jul 17 2014
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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FORMULA
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a(n) = 9*A279769(n). - M. F. Hasler, Dec 23 2016
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MATHEMATICA
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Select[Range[1000], Total[IntegerDigits[#]] == 18 &]
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PROG
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(MAGMA) [n: n in [1..1000] | &+Intseq(n) eq 18];
(Haskell)
a235228 n = a235228_list !! (n-1)
a235228_list = filter ((== 18) . a007953) [0..]
-- Reinhard Zumkeller, Jul 17 2014
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CROSSREFS
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Cf. A052217 - A052224, A061423, A143164, A166311, A166370, A166459.
Cf. A011557 (1), A052216 (2), A052217 (3), A052218 (4), A052219 (5), A052220 (6), A052221 (7), A052222 (8), A052223 (9), A052224 (10), A166311 (11), A235151 (12), A143164 (13), A235225(14), A235226 (15), A235227 (16), A166370 (17), A166459 (19), A235229 (20).
Cf. A242614, A242627.
Sequence in context: A075815 A075814 A320707 * A157947 A097599 A033674
Adjacent sequences: A235225 A235226 A235227 * A235229 A235230 A235231
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KEYWORD
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nonn,base,easy
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AUTHOR
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Vincenzo Librandi, Jan 05 2014
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STATUS
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approved
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