A235229 Numbers whose sum of digits is 20.

299, 389, 398, 479, 488, 497, 569, 578, 587, 596, 659, 668, 677, 686, 695, 749, 758, 767, 776, 785, 794, 839, 848, 857, 866, 875, 884, 893, 929, 938, 947, 956, 965, 974, 983, 992, 1199, 1289, 1298, 1379, 1388, 1397, 1469, 1478, 1487, 1496, 1559, 1568, 1577, 1586

Offset: 1

Author

Vincenzo Librandi, Jan 05 2014

Keywords

• base
• nonn

Comments

A007953(a(n)) = 20; number of repdigits = #{5555,44444,2222222222,1^20} = A242627(20) = 4. - Reinhard Zumkeller, Jul 17 2014

Links

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

Crossrefs

Cf. A052217 - A052224, 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), A235228 (18), A166459 (19).

Cf. A242614, A242627.

Programs

Haskell

a235229 n = a235229_list !! (n-1)
a235229_list = filter ((== 20) . a007953) [0..]
-- Reinhard Zumkeller, Jul 17 2014

Magma

[n: n in [1..2000] | &+Intseq(n) eq 20];

Mathematica

Select[Range[2000], Total[IntegerDigits[#]]==20&]