71111: Near Repdigit 711..11

First few terms (base 10): \[[71^*_{10}]_n=\{7,71,711,7111,71111,\ldots\}\]

General Formula:\[[71^*_{10}]_n={64\cdot10^{n}-1\over9}\]

Equivalent Patterns: \[[35^*_{10}]_n=5\cdot[71^*_{10}]_{n-1}\] \[[17^*5_{10}]_n=25\cdot[71^*_{10}]_{n-1}\]

See Also: Factorization of 711..11 on stdkmd.net

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