12111: Near Repdigit 1211..11

First few terms (base 10): \[[121^*_5]_n=\{7,36,181,906,4531,\ldots\}\]

First few terms (base 5): \[\{\text{12},\text{121},\text{1211},\text{12111},\text{121111},\ldots\}\]

General Formula:\[[121^*_5]_n={29\cdot5^{n}-1\over4}\]

Equivalent Patterns: \[[242^*_5]_n=2\cdot[121^*_5]_n\]

Table

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