A088952 Numbers that are squarefree words in ternary representation.

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

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