42221: Quasi Repdigit 422..221

First few terms (base 10): \[[42^*1_9]_n=\{37,343,3097,27883,250957,\ldots\}\]

First few terms (base 9): \[\{\text{41},\text{421},\text{4221},\text{42221},\text{422221},\ldots\}\]

General Formula:\[[42^*1_9]_n={153\cdot9^{n}-5\over4}\]

Equivalent Patterns: \[[84^*2_9]_n=2\cdot[42^*1_9]_n\]

Table

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