39997: Quasi Repdigit 399..997

First few terms (base 10): \[[39^*7_{10}]_n=\{37,397,3997,39997,399997,\ldots\}\]

General Formula:\[[39^*7_{10}]_n=40\cdot10^{n}-3\]

Equivalent Patterns: \[[79^*4_{10}]_n=2\cdot[39^*7_{10}]_n\]

See Also: Factorization of 399..997 on stdkmd.net

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