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

First few terms (base 10): \[[2^*52^*_7]_n=\{5,135,5749,275543,13458405,\ldots\}\]

First few terms (base 7): \[\{\text{5},\text{252},\text{22522},\text{2225222},\text{222252222},\ldots\}\]

General Formula:\[[2^*52^*_7]_n={7\cdot7^{2n}+9\cdot7^{n}-1\over3}\]

Equivalent Patterns: (none)

Table

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