77577: Near Repdigit Palindrome 77..77577..77

First few terms (base 10): \[[7^*57^*_9]_n=\{5,619,51505,4183639,338979805,\ldots\}\]

First few terms (base 9): \[\{\text{5},\text{757},\text{77577},\text{7775777},\text{777757777},\ldots\}\]

General Formula:\[[7^*57^*_9]_n={63\cdot9^{2n}-16\cdot9^{n}-7\over8}\]

Equivalent Patterns: (none)

Table

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