A081928 Sum of the n smallest numbers having the sum of their digits equal to n.

1, 13, 36, 70, 115, 171, 238, 316, 405, 604, 868, 1197, 1591, 2158, 2844, 3829, 5140, 6939, 9415, 12100, 14994, 18493, 26062, 34650, 49414, 69535, 96534, 129412, 164299, 201195, 240154, 281122, 414036, 584635, 852634, 1212633, 1629532

Offset

1,2

Comments

Sum of n-th row of A081926.

Links

Table of n, a(n) for n=1..37.

Example

The two smallest numbers with digit sum 2 are 2 and 11, whose sum is 13.
For seven, 7+16+25+34+43+52+61=238.

Mathematica

a[n_] := Module[{}, co = 0; in = 1; su = 0; While[co < n, If[Plus @@ IntegerDigits[in] == n, co++; su = su + in]; in++ ]; su]; Table[a[n], {n, 1, 30}] (Steinerberger)

Crossrefs

Cf. A081926, A081927, A051865.

Sequence in context: A054285 A101103 A051865 * A034129 A243038 A297303

Adjacent sequences: A081925 A081926 A081927 * A081929 A081930 A081931

Keyword

base,easy,nonn

Author

Amarnath Murthy, Apr 01 2003

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 19 2003

Edited by N. J. A. Sloane, Jul 02 2008 at the suggestion of R. J. Mathar

Status

approved