11121: Near Repdigit 11..1121

First few terms (base 10): \[[1^*21_8]_n=\{17,81,593,4689,37457,\ldots\}\]

First few terms (base 8): \[\{\text{21},\text{121},\text{1121},\text{11121},\text{111121},\ldots\}\]

General Formula:\[[1^*21_8]_n={64\cdot8^{n}+55\over7}\]

Equivalent Patterns: \[[3^*63_8]_n=3\cdot[1^*21_8]_n\] \[[2^*42_8]_n=2\cdot[1^*21_8]_n\]

Table

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