11131: Near Repdigit 11..1131

First few terms (base 10): \[[1^*31_9]_n=\{28,109,838,7399,66448,\ldots\}\]

First few terms (base 9): \[\{\text{31},\text{131},\text{1131},\text{11131},\text{111131},\ldots\}\]

General Formula:\[[1^*31_9]_n={81\cdot9^{n}+143\over8}\]

Equivalent Patterns: \[[2^*62_9]_n=2\cdot[1^*31_9]_n\]

Table

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