18888: Near Repdigit 188..88

First few terms (base 10): \[[18^*_9]_n=\{1,17,161,1457,13121,\ldots\}\]

First few terms (base 9): \[\{\text{1},\text{18},\text{188},\text{1888},\text{18888},\ldots\}\]

General Formula:\[[18^*_9]_n=2\cdot9^{n}-1\]

Equivalent Patterns: \[[38^*7_9]_n=2\cdot[18^*_9]_{n+1}\] \[[78^*5_9]_n=4\cdot[18^*_9]_{n+1}\] \[[58^*6_9]_n=3\cdot[18^*_9]_{n+1}\]

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