47777: Near Repdigit 477..77

First few terms (base 10): \[[47^*_9]_n=\{4,43,394,3553,31984,\ldots\}\]

First few terms (base 9): \[\{\text{4},\text{47},\text{477},\text{4777},\text{47777},\ldots\}\]

General Formula:\[[47^*_9]_n={39\cdot9^{n}-7\over8}\]

Equivalent Patterns: \[[15^*3_9]_n=3\cdot[47^*_9]_n\]

Table

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