

A031007


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


18



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, 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, 5, 3, 5, 4, 5, 5, 5, 6, 5, 0, 6, 1, 6, 2, 6, 3, 6, 4, 6, 5, 6, 6, 6
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OFFSET

0,3


LINKS

Table of n, a(n) for n=0..90.


MATHEMATICA

Flatten[Table[Reverse[IntegerDigits[n, 7]], {n, 0, 50}]] (* Harvey P. Dale, Feb 25 2014 *)


PROG

(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


CROSSREFS

Cf. A030308, A030341, A030386, A031235, A030567, A031045, A031087, A031298 for the base2 to base10 analogs.
Sequence in context: A265536 A037849 A037885 * A010876 A309958 A055400
Adjacent sequences: A031004 A031005 A031006 * A031008 A031009 A031010


KEYWORD

nonn,base,tabf,less


AUTHOR

Clark Kimberling


EXTENSIONS

Initial 0 and better name by Philippe Deléham, Oct 20 2011.


STATUS

approved



