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Table of n, a(n) for n=0..57.
Tersum m + n: write m and n in base 3 and add mod 3 with no carries, e.g. 5 + 8 = "21" + "22" = "10" = 1.
Sequence in context: A128158 A278824 A085095 * A096181 A248941 A261306
Adjacent sequences: A004503 A004504 A004505 * A004507 A004508 A004509
N. J. A. Sloane.