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 A031298 Triangle T(n,k): write n in base 10, reverse order of digits. 42
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 1, 8, 1, 9, 1, 0, 2, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 2, 8, 2, 9, 2, 0, 3, 1, 3, 2, 3, 3, 3, 4, 3, 5, 3, 6, 3, 7, 3, 8, 3, 9, 3, 0, 4, 1, 4, 2, 4, 3, 4, 4, 4, 5, 4, 6, 4, 7, 4, 8, 4, 9, 4, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The length of n-th row is given in A055642(n). - Reinhard Zumkeller, Jul 04 2012 According to the formula for T(n,1), columns are numbered starting with 1. One might also number columns starting with the offset 0, as to have the coefficient of 10^k in column k. - M. F. Hasler, Jul 21 2013 LINKS Reinhard Zumkeller, Rows n = 0..2500 of triangle, flattened FORMULA T(n,1) = A010879(n); T(n,A055642(n)) = A000030(n). - Reinhard Zumkeller, Jul 04 2012 PROG (Haskell) a031298 n k = a031298_tabf !! n !! k a031298_row n = a031298_tabf !! n a031298_tabf = iterate succ [0] where    succ []     = [1]    succ (9:ds) = 0 : succ ds    succ (d:ds) = (d + 1) : ds -- Reinhard Zumkeller, Jul 04 2012 (PARI) T(n, k)=n\10^(k-1)%10 \\ - M. F. Hasler, Jul 21 2013 CROSSREFS Cf. A030308, A030341, A030386, A031235, A030567, A031007, A031045, A031087 for the base-2 to base-9 analogs. Sequence in context: A252648 A054054 A115353 * A004428 A004429 A004426 Adjacent sequences:  A031295 A031296 A031297 * A031299 A031300 A031301 KEYWORD nonn,base,tabf,less,look AUTHOR EXTENSIONS Initial 0 and better name by Philippe Deléham, Oct 20 2011. Edited by M. F. Hasler, Jul 21 2013 STATUS approved

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Last modified May 30 08:04 EDT 2020. Contains 334712 sequences. (Running on oeis4.)