31111: Near Repdigit 311..11

First few terms (base 10): \[[31^*_9]_n=\{3,28,253,2278,20503,\ldots\}\]

First few terms (base 9): \[\{\text{3},\text{31},\text{311},\text{3111},\text{31111},\ldots\}\]

General Formula:\[[31^*_9]_n={25\cdot9^{n}-1\over8}\]

Equivalent Patterns: \[[62^*_9]_n=2\cdot[31^*_9]_n\]

Table

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