A071770 Tersum n + [n/3] (answer recorded in base 10).

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

Offset

0,3

Comments

Some numbers occur more than once, but they are sparse.

Links

Table of n, a(n) for n=0..73.

P. Mathonet, M. Rigo, M. Stipulanti and N. Zénaïdi, On digital sequences associated with Pascal's triangle, arXiv:2201.06636 [math.NT], 2022.

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: A099520 A327432 A159958 * A370933 A105529 A329454

Adjacent sequences: A071767 A071768 A071769 * A071771 A071772 A071773

Keyword

nonn

Author

Paul D. Hanna, Jun 04 2002

Status

approved