A031298 - OEIS

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A031298

Triangle T(n,k): write n in base 10, reverse order of digits.

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

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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

MATHEMATICA

Table[Reverse[IntegerDigits[n]], {n, 0, 50}]//Flatten (* Harvey P. Dale, Mar 07 2023 *)

PROG

(Haskell)

a031298 n k = a031298_tabf !! n !! k

a031298_row n = a031298_tabf !! n

a031298_tabf = iterate succ [0] where

succ [] = [1]