OFFSET
1,2
COMMENTS
This is A034886 with duplicate terms removed.
FORMULA
a(n) = A034886(n+3) for n>=4.
MATHEMATICA
DeleteDuplicates @ IntegerLength[Range[71]!] (* Amiram Eldar, Dec 24 2020 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Christian Amet, Dec 18 2020
STATUS
approved