OFFSET
1,3
COMMENTS
Conjecture: sequence contains only
- numbers of the form k*10^j (j>=0, k>=0),
- numbers of the form 10X, where X = string of k digits containing one digit 9 and k-1 digits 0 (k>=1),
- numbers of form 9Y10Z; where Y = string of k digits 0 (k>=0), Z = string of j digits 0 (j>=0).
Subsequence of A052018.
EXAMPLE
109 is a term because all possible sums of digits 0, 1, 1, 9, 9, 10 are its substrings.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Jaroslav Krizek, Jan 06 2012
STATUS
approved