22722: Near Repdigit Palindrome 22..22722..22

First few terms (base 10): \[[2^*72^*_9]_n=\{7,227,15167,1199387,96887927,\ldots\}\]

First few terms (base 9): \[\{\text{7},\text{272},\text{22722},\text{2227222},\text{222272222},\ldots\}\]

General Formula:\[[2^*72^*_9]_n={9\cdot9^{2n}+20\cdot9^{n}-1\over4}\]

Equivalent Patterns: (none)

Table

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