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A082575 Nonnegative numbers in (3*A005836) union (3*A005836 - 2) [A005836 lists the numbers with base-3 representation containing no 2]. 0
0, 1, 3, 7, 9, 10, 12, 25, 27, 28, 30, 34, 36, 37, 39, 79, 81, 82, 84, 88, 90, 91, 93, 106, 108, 109, 111, 115, 117, 118, 120, 241, 243, 244, 246, 250, 252, 253, 255, 268, 270, 271, 273, 277, 279, 280, 282, 322, 324, 325, 327, 331, 333, 334, 336, 349, 351, 352 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

n such that the Motzkin number A001006(n) = 1 (mod 3).

LINKS

Table of n, a(n) for n=1..58.

MATHEMATICA

(* m = MotzkinNumber *) m[0] = 1; m[n_] := m[n] = m[n - 1] + Sum[m[k]*m[n - 2 - k], {k, 0, n - 2}]; Select[Range[0, 400], Mod[m[#], 3] == 1 &] (* Jean-Fran├žois Alcover, Jul 10 2013 *)

CROSSREFS

Cf. A001006, A005836.

Sequence in context: A063551 A160800 A099248 * A284526 A294571 A083214

Adjacent sequences:  A082572 A082573 A082574 * A082576 A082577 A082578

KEYWORD

nonn

AUTHOR

Emeric Deutsch and Bruce E. Sagan, Dec 05 2003

EXTENSIONS

Offset changed to 1 (sequence is a list) by L. Edson Jeffery, Nov 27 2015

STATUS

approved

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Last modified July 12 09:35 EDT 2020. Contains 335657 sequences. (Running on oeis4.)