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 A031087 Triangle T(n,k): write n in base 9, reverse order of digits. 22
 0, 1, 2, 3, 4, 5, 6, 7, 8, 0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 1, 8, 1, 0, 2, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 2, 8, 2, 0, 3, 1, 3, 2, 3, 3, 3, 4, 3, 5, 3, 6, 3, 7, 3, 8, 3, 0, 4, 1, 4, 2, 4, 3, 4, 4, 4, 5, 4, 6, 4, 7, 4, 8, 4, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Reinhard Zumkeller, Rows n = 0..1000 of triangle, flattened PROG (PARI) A031087(n, k=-1)=/*k<0&&error("Flattened sequence not yet implemented.")*/n\9^k%9 \\ Assuming that columns are numbered starting with k=0 as in A030308, A030567 and others. - M. F. Hasler, Jul 21 2013 (Haskell) a031087 n k = a031087_row n !! (k-1) a031087_row n | n < 9     = [n]               | otherwise = m : a031087_row n' where (n', m) = divMod n 9 a031087_tabf = map a031087_row [0..] -- Reinhard Zumkeller, Jul 07 2015 CROSSREFS Cf. A030308, A030341, A030386, A031235, A030567, A031007, A031045, A031298 for the base-2 to base-10 analogs. Cf. A031076, A007095. Sequence in context: A037887 A207505 A235049 * A010878 A309788 A257849 Adjacent sequences:  A031084 A031085 A031086 * A031088 A031089 A031090 KEYWORD nonn,base,tabf,less AUTHOR EXTENSIONS Initial 0 and better name by Philippe Deléham, Oct 20 2011 STATUS approved

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Last modified October 15 04:33 EDT 2019. Contains 328026 sequences. (Running on oeis4.)