77877: Near Repdigit Palindrome 77..77877..77

First few terms (base 10): \[[7^*87^*_{10}]_n=\{8,787,77877,7778777,777787777,\ldots\}\]

General Formula:\[[7^*87^*_{10}]_n={70\cdot10^{2n}+9\cdot10^{n}-7\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 77..77877..77 on stdkmd.net

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