66665: Near Repdigit 66..665

First few terms (base 10): \[[6^*5_9]_n=\{5,59,545,4919,44285,\ldots\}\]

First few terms (base 9): \[\{\text{5},\text{65},\text{665},\text{6665},\text{66665},\ldots\}\]

General Formula:\[[6^*5_9]_n={27\cdot9^{n}-7\over4}\]

Equivalent Patterns: \[[14^*1_9]_n=2\cdot[6^*5_9]_n\] \[[28^*2_9]_n=4\cdot[6^*5_9]_n\]

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