77677: Near Repdigit Palindrome 77..77677..77

First few terms (base 10): \[[7^*67^*_9]_n=\{6,628,51586,4184368,338986366,\ldots\}\]

First few terms (base 9): \[\{\text{6},\text{767},\text{77677},\text{7776777},\text{777767777},\ldots\}\]

General Formula:\[[7^*67^*_9]_n={63\cdot9^{2n}-8\cdot9^{n}-7\over8}\]

Equivalent Patterns: (none)

Table

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