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A031007 Triangle T(n,k): Write n in base 7, reverse order of digits, to get row n. 18

%I

%S 0,1,2,3,4,5,6,0,1,1,1,2,1,3,1,4,1,5,1,6,1,0,2,1,2,2,2,3,2,4,2,5,2,6,

%T 2,0,3,1,3,2,3,3,3,4,3,5,3,6,3,0,4,1,4,2,4,3,4,4,4,5,4,6,4,0,5,1,5,2,

%U 5,3,5,4,5,5,5,6,5,0,6,1,6,2,6,3,6,4,6,5,6,6,6

%N Triangle T(n,k): Write n in base 7, reverse order of digits, to get row n.

%t Flatten[Table[Reverse[IntegerDigits[n,7]],{n,0,50}]] (* _Harvey P. Dale_, Feb 25 2014 *)

%o (PARI) A031007(n, k=-1)={k<0&&error("Flattened sequence not yet implemented.");n\7^k%7} \\ Assuming that columns start with k=0 as in A030308, A030341, ... TO DO: implement flattened sequence, such that A030567(n)=a(n). - M. F. Hasler, Jul 21 2013

%Y Cf. A030308, A030341, A030386, A031235, A030567, A031045, A031087, A031298 for the base-2 to base-10 analogs.

%K nonn,base,tabf,less

%O 0,3

%A _Clark Kimberling_

%E Initial 0 and better name by _Philippe Deléham_, Oct 20 2011.

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Last modified February 20 07:28 EST 2020. Contains 332067 sequences. (Running on oeis4.)