55255: Near Repdigit Palindrome 55..55255..55

First few terms (base 10): \[[5^*25^*_{10}]_n=\{2,525,55255,5552555,555525555,\ldots\}\]

General Formula:\[[5^*25^*_{10}]_n={50\cdot10^{2n}-27\cdot10^{n}-5\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 55..55255..55 on stdkmd.net

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