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 A002998 Smallest multiple of n whose digits sum to n. (Formerly M0489) 15
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 190, 209, 48, 247, 266, 195, 448, 476, 198, 874, 3980, 399, 2398, 1679, 888, 4975, 1898, 999, 7588, 4988, 39990, 8959, 17888, 42999, 28798, 57995, 29988, 37999, 59888, 49998, 699880, 177899, 88998, 99889, 479996, 499995 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS a(n) = A131382(n) * n. - Michel Marcus, Dec 10 2012 The subsequence of repdigits is: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 888, 999, 999999999, 999999999999999999999999999, ... and their indices are: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 24, 27, 81, 243, 729, 999, ... - Michel Marcus, Apr 14 2015 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS David Wilson, Table of n, a(n) for n = 0..1000 H. Fredricksen, E. J. Ionascu, F. Luca, P. Stanica, Minimal Niven numbers, arXiv:0803.0477 [math.NT], 2008. H. Fredricksen, E. J. Ionascu, F. Luca, P. Stanica, Minimal Niven numbers, Acta Arithmetica 132(2008), 135-159. H. W. Gould, Letters to N. J. A. Sloane, 1974 David Wilson, C++ program MATHEMATICA Flatten[Table[Select[n Range[100000], Total[IntegerDigits[#]] == n&, 1], {n, 0, 50}]] (* Harvey P. Dale, Oct 30 2011 *) PROG (PARI) a(n)=my(k); while(sumdigits(k+=n)!=n, ); k \\ Charles R Greathouse IV, Feb 01 2013 CROSSREFS Cf. A005349, A131382. Sequence in context: A032569 A254960 A039723 * A061276 A249515 A217555 Adjacent sequences:  A002995 A002996 A002997 * A002999 A003000 A003001 KEYWORD nonn,base,easy,nice AUTHOR EXTENSIONS More terms from Erich Friedman, Jul 04 2001 STATUS approved

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Last modified October 23 05:56 EDT 2019. Contains 328335 sequences. (Running on oeis4.)