68889: Quasi Repdigit 688..889

First few terms (base 10): \[[68^*9_{10}]_n=\{69,689,6889,68889,688889,\ldots\}\]

General Formula:\[[68^*9_{10}]_n={620\cdot10^{n}+1\over9}\]

Equivalent Patterns: \[[34^*5_{10}]_n=5\cdot[68^*9_{10}]_{n-1}\]

See Also: Factorization of 688..889 on stdkmd.net

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