47777: Near Repdigit 477..77

First few terms (base 10): \[[47^*_{10}]_n=\{4,47,477,4777,47777,\ldots\}\]

General Formula:\[[47^*_{10}]_n={43\cdot10^{n}-7\over9}\]

Equivalent Patterns: \[[95^*4_{10}]_n=2\cdot[47^*_{10}]_{n+1}\]

See Also: Factorization of 477..77 on stdkmd.net

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