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 A071770 Tersum n + [n/3] (answer recorded in base 10). 0
 0, 1, 2, 4, 5, 3, 8, 6, 7, 12, 13, 14, 16, 17, 15, 11, 9, 10, 24, 25, 26, 19, 20, 18, 23, 21, 22, 9, 37, 38, 40, 41, 39, 44, 42, 43, 48, 49, 50, 52, 53, 51, 47, 45, 46, 33, 34, 35, 28, 29, 27, 32, 30, 31, 72, 73, 74, 76, 77, 75, 80, 78, 79, 57, 58, 59, 61, 62, 60, 56, 54, 55, 69, 70 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Some numbers occur more than once, but they are sparse. LINKS FORMULA 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. See A004482 for references. CROSSREFS Cf. A004482. Sequence in context: A026257 A099520 A159958 * A105529 A120237 A026182 Adjacent sequences:  A071767 A071768 A071769 * A071771 A071772 A071773 KEYWORD nonn AUTHOR Paul D. Hanna, Jun 04 2002 STATUS approved

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Last modified August 18 08:57 EDT 2019. Contains 326077 sequences. (Running on oeis4.)