A336759 a(n) is the smallest positive number that is the sum of no fewer than n distinct repdigits.
1, 10, 21, 309, 2108, 21996, 220884, 2111105, 21866660
Offset: 1
Examples
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.
Extensions
a(7)-a(9) from Sean A. Irvine, Aug 29 2020
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