A004507 Tersum n + 18.

18, 19, 20, 21, 22, 23, 24, 25, 26, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 45, 46, 47, 48, 49, 50, 51, 52, 53, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 72, 73, 74, 75

Offset

0,1

Links

Table of n, a(n) for n=0..57.

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.

Crossrefs

Sequence in context: A357800 A004459 A347282 * A296760 A297290 A270044

Adjacent sequences: A004504 A004505 A004506 * A004508 A004509 A004510

Keyword

nonn

Author

N. J. A. Sloane

Status

approved