66665: Near Repdigit 66..665

First few terms (base 10): \[[6^*5_7]_n=\{5,47,341,2399,16805,\ldots\}\]

First few terms (base 7): \[\{\text{5},\text{65},\text{665},\text{6665},\text{66665},\ldots\}\]

General Formula:\[[6^*5_7]_n=7\cdot7^{n}-2\]

Equivalent Patterns: \[[16^*3_7]_n=2\cdot[6^*5_7]_n\] \[[26^*1_7]_n=3\cdot[6^*5_7]_n\]

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