97777: Near Repdigit 977..77

First few terms (base 10): \[[97^*_{10}]_n=\{9,97,977,9777,97777,\ldots\}\]

General Formula:\[[97^*_{10}]_n={88\cdot10^{n}-7\over9}\]

Equivalent Patterns: \[[48^*5_{10}]_n=5\cdot[97^*_{10}]_n\]

See Also: Factorization of 977..77 on stdkmd.net

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