OFFSET
1,2
LINKS
Ivan Neretin, Table of n, a(n) for n = 1..10000
MATHEMATICA
Rest@Nest[Append[#, If[FreeQ[#, r = Quotient[#[[-1]], 3]], r, 10 #[[-1]]]] &, {0, 1}, 56] (* Ivan Neretin, Jul 31 2016 *)
PROG
(PARI) first(n)=my(v=vector(n), t); v[1]=1; for(i=2, n, t=v[i-1]\3; if(t<2, v[i]=10*v[i-1]; next); for(j=1, i-1, if(v[j]==t, v[i]=10*v[i-1]; next(2))); v[i]=t); v \\ Charles R Greathouse IV, Jul 31 2016
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved