66661: Near Repdigit 66..661

First few terms (base 10): \[[6^*1_9]_n=\{1,55,541,4915,44281,\ldots\}\]

First few terms (base 9): \[\{\text{1},\text{61},\text{661},\text{6661},\text{66661},\ldots\}\]

General Formula:\[[6^*1_9]_n={27\cdot9^{n}-23\over4}\]

Equivalent Patterns: (none)

Table

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