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28887: Quasi Repdigit 288..887

First few terms (base 10): \[[28^*7_{10}]_n=\{27,287,2887,28887,288887,\ldots\}\]

General Formula:\[[28^*7_{10}]_n={260\cdot10^{n}-17\over9}\]

Equivalent Patterns: \[[86^*1_{10}]_n=3\cdot[28^*7_{10}]_n\] \[[57^*4_{10}]_n=2\cdot[28^*7_{10}]_n\]

See Also: Factorization of 288..887 on stdkmd.net

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