OFFSET
1,2
COMMENTS
Conjecture: the sequence is infinite.
EXAMPLE
10 is the sum of 2 distinct repdigits: 9 + 1
21 is the sum of 3 distinct repdigits: 11 + 9 + 1
309 is the sum of 4 distinct repdigits: 222 + 77 + 9 + 1
2108 is the sum of 5 distinct repdigits: 1111 + 888 + 99 + 9 + 1
All numbers less than 10 can be summed with less than 2 distinct repdigits.
All numbers less than 21 can be summed with less than 3 distinct repdigits.
CROSSREFS
KEYWORD
nonn,base,more
AUTHOR
Falcon Shapiro, Aug 03 2020
EXTENSIONS
a(7)-a(9) from Sean A. Irvine, Aug 29 2020
STATUS
approved