OFFSET
1,1
EXAMPLE
3 -> 343 -> 3433443343 -> ...
MATHEMATICA
SubstitutionSystem[{3->{3, 4, 3}, 4->{3, 4, 4, 3}}, {3}, {5}][[1]] (* Harvey P. Dale, Jan 01 2024 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Matthew Vandermast, Mar 14 2003
STATUS
approved