16664: Quasi Repdigit 166..664

First few terms (base 10): \[[16^*4_{10}]_n=\{14,164,1664,16664,166664,\ldots\}\]

General Formula:\[[16^*4_{10}]_n=2\cdot{25\cdot10^{n}-4\over3}\]

Equivalent Patterns: \[[83^*2_{10}]_n=[16^*4_{10}]_{n+1}/2\] \[[49^*2_{10}]_n=3\cdot[16^*4_{10}]_n\] \[[6^*56_{10}]_n=4\cdot[16^*4_{10}]_n\]

See Also: Factorization of 499..992 on stdkmd.net

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