22522: Near Repdigit Palindrome 22..22522..22

First few terms (base 10): \[[2^*52^*_9]_n=\{5,209,15005,1197929,96874805,\ldots\}\]

First few terms (base 9): \[\{\text{5},\text{252},\text{22522},\text{2225222},\text{222252222},\ldots\}\]

General Formula:\[[2^*52^*_9]_n={9\cdot9^{2n}+12\cdot9^{n}-1\over4}\]

Equivalent Patterns: (none)

Table

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