22122: Near Repdigit Palindrome 22..22122..22

First few terms (base 10): \[[2^*12^*_4]_n=\{1,38,666,10858,174506,\ldots\}\]

First few terms (base 4): \[\{\text{1},\text{212},\text{22122},\text{2221222},\text{222212222},\ldots\}\]

General Formula:\[[2^*12^*_4]_n={8\cdot4^{2n}-3\cdot4^{n}-2\over3}\]

Equivalent Patterns: (none)

Table

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