28887: Quasi Repdigit 288..887

First few terms (base 10): \[[28^*7_9]_n=\{25,241,2185,19681,177145,\ldots\}\]

First few terms (base 9): \[\{\text{27},\text{287},\text{2887},\text{28887},\text{288887},\ldots\}\]

General Formula:\[[28^*7_9]_n=27\cdot9^{n}-2\]

Equivalent Patterns: \[[58^*5_9]_n=2\cdot[28^*7_9]_n\] \[[8^*3_9]_n=3\cdot[28^*7_9]_{n-1}\]

Table

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