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A088952 Numbers that are squarefree words in ternary representation. 3
0, 1, 2, 3, 5, 6, 7, 10, 11, 15, 16, 19, 20, 21, 23, 32, 33, 34, 46, 47, 48, 57, 59, 61, 64, 65, 69, 96, 97, 100, 102, 104, 138, 140, 142, 145, 146, 173, 177, 178, 183, 185, 194, 195, 196, 208, 209, 289, 290, 291, 300, 302, 307, 312, 416, 421, 426, 428, 437, 438 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A088950(a(n)) = 0.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program for A088952

Eric Weisstein's World of Mathematics, Squarefree Word

MATHEMATICA

Select[Range[0, 500], MatchQ[IntegerDigits[#, 3], Except[{___, x__, x__, ___}]] &] (* Vladimir Reshetnikov, May 17 2016 *)

PROG

(PARI) See Links section.

CROSSREFS

Cf. A007089, A088953.

Sequence in context: A032892 A031941 A043089 * A303541 A293523 A032851

Adjacent sequences:  A088949 A088950 A088951 * A088953 A088954 A088955

KEYWORD

nonn,base

AUTHOR

Reinhard Zumkeller, Oct 25 2003

STATUS

approved

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Last modified August 10 07:37 EDT 2020. Contains 336368 sequences. (Running on oeis4.)