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28889: Quasi Repdigit 288..889

First few terms (base 10): \[[28^*9_{10}]_n=\{29,289,2889,28889,288889,\ldots\}\]

General Formula:\[[28^*9_{10}]_n={260\cdot10^{n}+1\over9}\]

Equivalent Patterns: \[[86^*7_{10}]_n=3\cdot[28^*9_{10}]_n\] \[[57^*8_{10}]_n=2\cdot[28^*9_{10}]_n\] \[[14^*5_{10}]_n=5\cdot[28^*9_{10}]_{n-1}\] \[[43^*5_{10}]_n=15\cdot[28^*9_{10}]_{n-1}\] \[[72^*5_{10}]_n=25\cdot[28^*9_{10}]_{n-1}\]

See Also: Factorization of 288..889 on stdkmd.net

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