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A081928 Sum of the n smallest numbers having the sum of their digits equal to n. 2
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified October 17 02:04 EDT 2019. Contains 328106 sequences. (Running on oeis4.)