11811: Near Repdigit Palindrome 11..11811..11

First few terms (base 10): \[[1^*81^*_{10}]_n=\{8,181,11811,1118111,111181111,\ldots\}\]

General Formula:\[[1^*81^*_{10}]_n={10\cdot10^{2n}+63\cdot10^{n}-1\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 11..11811..11 on stdkmd.net

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