11611: Near Repdigit Palindrome 11..11611..11

First few terms (base 10): \[[1^*61^*_9]_n=\{6,136,7786,601516,48460366,\ldots\}\]

First few terms (base 9): \[\{\text{6},\text{161},\text{11611},\text{1116111},\text{111161111},\ldots\}\]

General Formula:\[[1^*61^*_9]_n={9\cdot9^{2n}+40\cdot9^{n}-1\over8}\]

Equivalent Patterns: (none)

Table

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