57777: Near Repdigit 577..77

First few terms (base 10): \[[57^*_{10}]_n=\{5,57,577,5777,57777,\ldots\}\]

General Formula:\[[57^*_{10}]_n={52\cdot10^{n}-7\over9}\]

Equivalent Patterns: \[[28^*5_{10}]_n=5\cdot[57^*_{10}]_n\]

See Also: Factorization of 577..77 on stdkmd.net

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