77877: Near Repdigit Palindrome 77..77877..77

First few terms (base 10): \[[7^*87^*_9]_n=\{8,646,51748,4185826,338999488,\ldots\}\]

First few terms (base 9): \[\{\text{8},\text{787},\text{77877},\text{7778777},\text{777787777},\ldots\}\]

General Formula:\[[7^*87^*_9]_n={63\cdot9^{2n}+8\cdot9^{n}-7\over8}\]

Equivalent Patterns: (none)

Table

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