27777: Near Repdigit 277..77

First few terms (base 10): \[[27^*_9]_n=\{2,25,232,2095,18862,\ldots\}\]

First few terms (base 9): \[\{\text{2},\text{27},\text{277},\text{2777},\text{27777},\ldots\}\]

General Formula:\[[27^*_9]_n={23\cdot9^{n}-7\over8}\]

Equivalent Patterns: \[[56^*5_9]_n=2\cdot[27^*_9]_{n+1}\] \[[85^*3_9]_n=3\cdot[27^*_9]_{n+1}\]

Table

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