33331: Near Repdigit 33..331

First few terms (base 10): \[[3^*1_9]_n=\{1,28,271,2458,22141,\ldots\}\]

First few terms (base 9): \[\{\text{1},\text{31},\text{331},\text{3331},\text{33331},\ldots\}\]

General Formula:\[[3^*1_9]_n={27\cdot9^{n}-19\over8}\]

Equivalent Patterns: \[[6^*2_9]_n=2\cdot[3^*1_9]_n\]

Table

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