21222: Near Repdigit 2122..22

First few terms (base 10): \[[212^*_5]_n=\{11,57,287,1437,7187,\ldots\}\]

First few terms (base 5): \[\{\text{21},\text{212},\text{2122},\text{21222},\text{212222},\ldots\}\]

General Formula:\[[212^*_5]_n={23\cdot5^{n}-1\over2}\]

Equivalent Patterns: \[[424^*_5]_n=2\cdot[212^*_5]_n\]

Table

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