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 A163326 Pick digits at the odd distance from the least significant end of the ternary expansion of n, then convert back to decimal. 7
 0, 0, 0, 1, 1, 1, 2, 2, 2, 0, 0, 0, 1, 1, 1, 2, 2, 2, 0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 3, 3, 3, 4, 4, 4, 5, 5, 5, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 7, 7, 7, 8, 8, 8, 6, 6, 6, 7, 7, 7, 8, 8, 8, 6, 6, 6, 7, 7, 7, 8, 8, 8, 0, 0, 0, 1, 1, 1, 2, 2, 2, 0, 0, 0, 1, 1, 1, 2, 2, 2, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 LINKS Antti Karttunen, Table of n, a(n) for n = 0..728 Kevin Ryde, Plot2 of X=A163325,Y=A163326, illustrating the ternary Z-order curve. FORMULA a(n) = A163325(floor(n/3)) a(n) = Sum_{k>=0} A030341(n,k)*b(k) with (b) = (0,1,0,3,0,9,0,27,0,81,0,243,0,...): powers of 3 alternating with zeros. - Philippe Deléham, Oct 22 2011 EXAMPLE 42 in ternary base (A007089) is written as '1120' (1*27 + 1*9 + 2*3 + 0), from which we pick the first and 3rd digits from the right (zero-based!), giving '12' = 1*3 + 2 = 5, thus a(42) = 5. PROG (PARI) a(n) = fromdigits(digits(n, 9)\3, 3); \\ Kevin Ryde, May 15 2020 CROSSREFS A059906 is an analogous sequence for binary. Note that A037314(A163325(n)) + 3*A037314(A163326(n)) = n for all n. Cf. A007089, A163327-A163329. Sequence in context: A180834 A214458 A133873 * A028953 A037865 A039969 Adjacent sequences:  A163323 A163324 A163325 * A163327 A163328 A163329 KEYWORD nonn,base AUTHOR Antti Karttunen, Jul 29 2009 EXTENSIONS Edited by Charles R Greathouse IV, Nov 01 2009 STATUS approved

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Last modified May 14 04:27 EDT 2021. Contains 343872 sequences. (Running on oeis4.)