11121: Near Repdigit 11..1121

First few terms (base 10): \[[1^*21_7]_n=\{15,64,407,2808,19615,\ldots\}\]

First few terms (base 7): \[\{\text{21},\text{121},\text{1121},\text{11121},\text{111121},\ldots\}\]

General Formula:\[[1^*21_7]_n={49\cdot7^{n}+41\over6}\]

Equivalent Patterns: \[[2^*42_7]_n=2\cdot[1^*21_7]_n\] \[[3^*63_7]_n=3\cdot[1^*21_7]_n\]

Table

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