22221: Near Repdigit 22..221

First few terms (base 10): \[[2^*1_6]_n=\{1,13,85,517,3109,\ldots\}\]

First few terms (base 6): \[\{\text{1},\text{21},\text{221},\text{2221},\text{22221},\ldots\}\]

General Formula:\[[2^*1_6]_n={12\cdot6^{n}-7\over5}\]

Equivalent Patterns: \[[4^*2_6]_n=2\cdot[2^*1_6]_n\] \[[3^*13_6]_n=9\cdot[2^*1_6]_n\]

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