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 A031045 Triangle T(n,k): write n in base 8, reverse order of digits. 19
 0, 1, 2, 3, 4, 5, 6, 7, 0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 5, 1, 6, 1, 7, 1, 0, 2, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 2, 0, 3, 1, 3, 2, 3, 3, 3, 4, 3, 5, 3, 6, 3, 7, 3, 0, 4, 1, 4, 2, 4, 3, 4, 4, 4, 5, 4, 6, 4, 7, 4, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 5, 6, 5, 7, 5, 0, 6, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Robert Israel, Table of n, a(n) for n = 0..10003 (rows 0 to 3646, flattened) MAPLE seq(op(convert(n, base, 8)), n=0..100); # Robert Israel, Jul 22 2019 MATHEMATICA Flatten[Table[Reverse[IntegerDigits[n, 8]], {n, 80}]] (* Harvey P. Dale, Aug 08 2011 *) PROG (PARI) A031045(n, k=-1)=/*k<0&&error("Flattened sequence not yet implemented."); */n\8^k%8 \\ Assuming that columns are numbered starting with k=0 as in A030308, A030341, ... Note: The operation could be done using bitwise arithmetic, bitand(n>>(3*k), 7), but this is not significantly faster in PARI. - M. F. Hasler, Jul 21 2013 CROSSREFS Cf. A030308, A030341, A030386, A031235, A030567, A031007, A031087, A031298 for the base-2 to base-10 analogs. Sequence in context: A265538 A037850 A037886 * A010877 A309959 A257848 Adjacent sequences:  A031042 A031043 A031044 * A031046 A031047 A031048 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 December 8 03:17 EST 2021. Contains 349590 sequences. (Running on oeis4.)