77775: Near Repdigit 77..775

First few terms (base 10): \[[7^*5_9]_n=\{5,68,635,5738,51665,\ldots\}\]

First few terms (base 9): \[\{\text{5},\text{75},\text{775},\text{7775},\text{77775},\ldots\}\]

General Formula:\[[7^*5_9]_n={63\cdot9^{n}-23\over8}\]

Equivalent Patterns: \[[16^*1_9]_n=2\cdot[7^*5_9]_n\]

Table

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