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A355906 a(0) = 0; for n >= 1, a(n) = -(3/2)*(a(n-1)+A355905(n-1)). 2
0, 0, -3, 3, -6, 9, -15, 21, -33, 48, -75, 111, -168, 252, -381, 570, -858, 1287, -1932, 2898, -4350, 6525, -9789, 14682, -22026, 33039, -49560, 74340, -111513, 167268, -250905, 376356, -564537, 846804, -1270209, 1905312, -2857971, 4286955, -6430434, 9645651 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
When n is odd, a(n) is the largest multiple of 3 whose NST representation has n digits. When n is even, a(n) is the smallest multiple of 3 with that property.
LINKS
Don Knuth, Ambidextrous Numbers, Preprint, September 2022. See b_n, (7.3).
CROSSREFS
Sequence in context: A293675 A050337 A299473 * A022086 A097135 A293677
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Sep 18 2022
EXTENSIONS
More terms from Jinyuan Wang, Sep 29 2022
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)