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A065364

Alternating sum of balanced ternary digits in n. Replace 3^k with (-1)^k in balanced ternary expansion of n.

1, -2, -1, 0, 1, 2, 3, 0, 1, 2, -1, 0, 1, -2, -1, 0, -3, -2, -1, -4, -3, -2, -1, 0, 1, -2, -1, 0, -3, -2, -1, 0, 1, 2, -1, 0, 1, -2, -1, 0, 1, 2, 3, 0, 1, 2, -1, 0, 1, 2, 3, 4, 1, 2, 3, 0, 1, 2, 3, 4, 5, 2, 3, 4, 1, 2, 3, 0, 1, 2, -1, 0, 1, -2, -1, 0, 1, 2, 3, 0, 1, 2, -1, 0, 1, 2, 3, 4, 1, 2, 3, 0, 1, 2, -1, 0, 1, -2, -1, 0, -3, -2, -1, 0

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OFFSET

1,2

COMMENTS

Notation: (3)<n>(-1).

LINKS

Michael De Vlieger, Table of n, a(n) for n = 1..10000

EXAMPLE

5 = +1(9)-1(3)-1(1) -> +1(+1)-1(-1)-1(+1) = +1 = a(5).

MATHEMATICA

Array[Total@ MapIndexed[#1 (2 Mod[First[#2], 2] - 1) &, Reverse@ #] &[Prepend[IntegerDigits[#, 3], 0] //. {a___, b_, 2, c___} :> {a, b + 1, -1, c}] &, 104] (* Michael De Vlieger, Jun 27 2020 *)

CROSSREFS

Cf. A059095, A065363, A065368.

Sequence in context: A058839 A275946 A287824 * A168318 A174203 A353642

Adjacent sequences: A065361 A065362 A065363 * A065365 A065366 A065367

KEYWORD

base,easy,sign

AUTHOR

Marc LeBrun, Oct 31 2001

STATUS

approved

URL: https://oeis.org/A065364

⇱ A065364 - OEIS