OFFSET
1,3
COMMENTS
Which "digits" are allowed? For instance, do we know that 2, 5, and 9 never appear?
LINKS
Michael De Vlieger and Michel Marcus, Table of n, a(n) for n = 1..100 (first 75 terms from Michel Marcus).
MATHEMATICA
See A158235.
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Mar 14 2009
STATUS
approved