A235228 Numbers whose sum of digits is 18.

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

Offset

1,1

Comments

A007953(a(n)) = 18; number of repdigits = #{99,666,333333,222222222,1^18} = A242627(18) = 5. - Reinhard Zumkeller, Jul 17 2014

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Formula

a(n) = 9*A279769(n). - M. F. Hasler, Dec 23 2016

Mathematica

Select[Range[1000], Total[IntegerDigits[#]] == 18 &]

Prog

(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

Crossrefs

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

Keyword

nonn,base,easy

Author

Vincenzo Librandi, Jan 05 2014

Status

approved