11511: Near Repdigit Palindrome 11..11511..11

First few terms (base 10): \[[1^*51^*_{10}]_n=\{5,151,11511,1115111,111151111,\ldots\}\]

General Formula:\[[1^*51^*_{10}]_n={10\cdot10^{2n}+36\cdot10^{n}-1\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 11..11511..11 on stdkmd.net

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