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A081606 Numbers having at least one 1 in their ternary representation. 6
1, 3, 4, 5, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 21, 22, 23, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 55, 57, 58, 59, 61, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 75, 76, 77, 79, 81, 82, 83, 84, 85, 86 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Complement of A005823.

n such that central Delannoy number A001850(n) == 0 (mod 3). - Emeric Deutsch and Bruce E. Sagan, Dec 04 2003

LINKS

Table of n, a(n) for n=1..71.

Johann Cigler, Some elementary observations on Narayana polynomials and related topics, arXiv:1611.05252 [math.CO], 2016. See p.25.

CROSSREFS

Cf. A007089, A062756, A081609, A081605, A074940.

Sequence in context: A180152 A162610 A155935 * A079945 A283736 A039017

Adjacent sequences:  A081603 A081604 A081605 * A081607 A081608 A081609

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Mar 23 2003

EXTENSIONS

More terms from Emeric Deutsch and Bruce E. Sagan, Dec 04 2003

STATUS

approved

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Last modified March 3 14:58 EST 2021. Contains 341762 sequences. (Running on oeis4.)