11121: Near Repdigit 11..1121

First few terms (base 10): \[[1^*21_4]_n=\{9,25,89,345,1369,\ldots\}\]

First few terms (base 4): \[\{\text{21},\text{121},\text{1121},\text{11121},\text{111121},\ldots\}\]

General Formula:\[[1^*21_4]_n={16\cdot4^{n}+11\over3}\]

Equivalent Patterns: (none)

Table

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