11121: Near Repdigit 11..1121

First few terms (base 10): \[[1^*21_9]_n=\{19,100,829,7390,66439,\ldots\}\]

First few terms (base 9): \[\{\text{21},\text{121},\text{1121},\text{11121},\text{111121},\ldots\}\]

General Formula:\[[1^*21_9]_n={81\cdot9^{n}+71\over8}\]

Equivalent Patterns: \[[2^*42_9]_n=2\cdot[1^*21_9]_n\] \[[4^*84_9]_n=4\cdot[1^*21_9]_n\] \[[3^*63_9]_n=3\cdot[1^*21_9]_n\]

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