16669: Quasi Repdigit 166..669

First few terms (base 10): \[[16^*9_{10}]_n=\{19,169,1669,16669,166669,\ldots\}\]

General Formula:\[[16^*9_{10}]_n={50\cdot10^{n}+7\over3}\]

Equivalent Patterns: \[[50^*7_{10}]_n=3\cdot[16^*9_{10}]_n\] \[[3^*8_{10}]_n=2\cdot[16^*9_{10}]_{n-1}\] \[[6^*76_{10}]_n=4\cdot[16^*9_{10}]_n\]

See Also: Factorization of 166..669 on stdkmd.net

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