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

Author

Amarnath Murthy, Apr 01 2003

Keywords

• base
• easy
• nonn

Comments

Sum of n-th row of A081926.

Examples

			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.
		

Crossrefs

Cf. A081926, A081927, A051865.

Programs

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)

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