16666: Near Repdigit 166..66

First few terms (base 10): \[[16^*_7]_n=\{1,13,97,685,4801,\ldots\}\]

First few terms (base 7): \[\{\text{1},\text{16},\text{166},\text{1666},\text{16666},\ldots\}\]

General Formula:\[[16^*_7]_n=2\cdot7^{n}-1\]

Equivalent Patterns: \[[36^*5_7]_n=2\cdot[16^*_7]_{n+1}\] \[[56^*4_7]_n=3\cdot[16^*_7]_{n+1}\]

Table

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