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A111020 Indices of Catalan numbers that are == 2 mod 3 (cf. A000108). 0
2, 3, 4, 8, 9, 10, 26, 27, 28, 38, 39, 40, 80, 81, 82, 92, 93, 94, 110, 111, 112, 116, 117, 118, 242, 243, 244, 254, 255, 256, 272, 273, 274, 278, 279, 280, 326, 327, 328, 332, 333, 334, 350, 351, 352, 362, 363, 364, 728, 729, 730, 740, 741, 742 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..54.

MATHEMATICA

Flatten[Position[CatalanNumber[Range[750]], _?(Mod[#, 3]==2&)]] (* Harvey P. Dale, Sep 21 2012 *)

CROSSREFS

Sequence in context: A079279 A246444 A045577 * A002971 A157318 A158031

Adjacent sequences:  A111017 A111018 A111019 * A111021 A111022 A111023

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, Sep 09 2005

STATUS

approved

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Last modified November 14 01:24 EST 2019. Contains 329108 sequences. (Running on oeis4.)