11121: Near Repdigit 11..1121

First few terms (base 10): \[[1^*21_5]_n=\{11,36,161,786,3911,\ldots\}\]

First few terms (base 5): \[\{\text{21},\text{121},\text{1121},\text{11121},\text{111121},\ldots\}\]

General Formula:\[[1^*21_5]_n={25\cdot5^{n}+19\over4}\]

Equivalent Patterns: \[[2^*42_5]_n=2\cdot[1^*21_5]_n\]

Table

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