66766: Near Repdigit Palindrome 66..66766..66

First few terms (base 10): \[[6^*76^*_9]_n=\{7,555,44367,3587955,290571927,\ldots\}\]

First few terms (base 9): \[\{\text{7},\text{676},\text{66766},\text{6667666},\text{666676666},\ldots\}\]

General Formula:\[[6^*76^*_9]_n={27\cdot9^{2n}+4\cdot9^{n}-3\over4}\]

Equivalent Patterns: (none)

Table

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