11311: Near Repdigit Palindrome 11..11311..11

First few terms (base 10): \[[1^*31^*_9]_n=\{3,109,7543,599329,48440683,\ldots\}\]

First few terms (base 9): \[\{\text{3},\text{131},\text{11311},\text{1113111},\text{111131111},\ldots\}\]

General Formula:\[[1^*31^*_9]_n={9\cdot9^{2n}+16\cdot9^{n}-1\over8}\]

Equivalent Patterns: \[[2^*62^*_9]_n=2\cdot[1^*31^*_9]_n\]

Table

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