55755: Near Repdigit Palindrome 55..55755..55

First few terms (base 10): \[[5^*75^*_{10}]_n=\{7,575,55755,5557555,555575555,\ldots\}\]

General Formula:\[[5^*75^*_{10}]_n={50\cdot10^{2n}+18\cdot10^{n}-5\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 55..55755..55 on stdkmd.net

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