21111: Near Repdigit 211..11

First few terms (base 10): \[[21^*_6]_n=\{2,13,79,475,2851,\ldots\}\]

First few terms (base 6): \[\{\text{2},\text{21},\text{211},\text{2111},\text{21111},\ldots\}\]

General Formula:\[[21^*_6]_n={11\cdot6^{n}-1\over5}\]

Equivalent Patterns: \[[42^*_6]_n=2\cdot[21^*_6]_n\]

Table

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