0,1
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: A050686 A165839 A004459 this_sequence A018823 A025144 A146331
Adjacent sequences: A004504 A004505 A004506 this_sequence A004508 A004509 A004510
nonn
N. J. A. Sloane (njas(AT)research.att.com).
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