27777: Near Repdigit 277..77

First few terms (base 10): \[[27^*_{10}]_n=\{2,27,277,2777,27777,\ldots\}\]

General Formula:\[[27^*_{10}]_n={25\cdot10^{n}-7\over9}\]

Equivalent Patterns: \[[83^*1_{10}]_n=3\cdot[27^*_{10}]_{n+1}\] \[[5^*4_{10}]_n=2\cdot[27^*_{10}]_n\] \[[16^*2_{10}]_n=6\cdot[27^*_{10}]_n\]

See Also: Factorization of 277..77 on stdkmd.net

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