72221: Quasi Repdigit 722..221

First few terms (base 10): \[[72^*1_{10}]_n=\{71,721,7221,72221,722221,\ldots\}\]

General Formula:\[[72^*1_{10}]_n={650\cdot10^{n}-11\over9}\]

Equivalent Patterns: \[[14^*2_{10}]_n=2\cdot[72^*1_{10}]_{n-1}\] \[[28^*4_{10}]_n=4\cdot[72^*1_{10}]_{n-1}\]

See Also: Factorization of 722..221 on stdkmd.net

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