77477: Near Repdigit Palindrome 77..77477..77

First few terms (base 10): \[[7^*47^*_{10}]_n=\{4,747,77477,7774777,777747777,\ldots\}\]

General Formula:\[[7^*47^*_{10}]_n={70\cdot10^{2n}-27\cdot10^{n}-7\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 77..77477..77 on stdkmd.net

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