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
KEYWORD
nonn,base
AUTHOR
Reinhard Zumkeller, Oct 25 2003
STATUS
approved