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A031235 Triangle T(n,k): write n in base 5, reverse order of digits. 26
0, 1, 2, 3, 4, 0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 0, 2, 1, 2, 2, 2, 3, 2, 4, 2, 0, 3, 1, 3, 2, 3, 3, 3, 4, 3, 0, 4, 1, 4, 2, 4, 3, 4, 4, 4, 0, 0, 1, 1, 0, 1, 2, 0, 1, 3, 0, 1, 4, 0, 1, 0, 1, 1, 1, 1, 1, 2, 1, 1, 3, 1, 1, 4, 1, 1, 0, 2, 1, 1, 2, 1, 2, 2, 1, 3, 2, 1, 4, 2, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
MATHEMATICA
Reverse[IntegerDigits[#, 5]]&/@Range[0, 40]//Flatten (* Harvey P. Dale, Aug 02 2016 *)
PROG
(PARI) A031235(n, k=-1)=/*k<0&&error("Flattened sequence not yet implemented.")*/n\5^k%5 \\ Assuming that columns are numbered starting with k=0 as in A030308, A030341, ... - M. F. Hasler, Jul 21 2013
(Haskell)
a031235 n k = a031235_tabf !! n !! k
a031235_row n = a031235_tabf !! n
a031235_tabf = iterate succ [0] where
succ [] = [1]
succ (4:ts) = 0 : succ ts
succ (t:ts) = (t + 1) : ts
-- Reinhard Zumkeller, Sep 18 2015
CROSSREFS
Cf. A030308, A030341, A030386, A030567, A031007, A031045, A031087, A031298 for the base-2 to base-10 analogs.
Cf. A007091.
Sequence in context: A023868 A122275 A197024 * A090141 A049264 A010874
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 March 19 04:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)