12111: Near Repdigit 1211..11

First few terms (base 10): \[[121^*_4]_n=\{6,25,101,405,1621,\ldots\}\]

First few terms (base 4): \[\{\text{12},\text{121},\text{1211},\text{12111},\text{121111},\ldots\}\]

General Formula:\[[121^*_4]_n={19\cdot4^{n}-1\over3}\]

Equivalent Patterns: (none)

Table

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