21111: Near Repdigit 211..11

First few terms (base 10): \[[21^*_{10}]_n=\{2,21,211,2111,21111,\ldots\}\]

General Formula:\[[21^*_{10}]_n={19\cdot10^{n}-1\over9}\]

Equivalent Patterns: \[[63^*_{10}]_n=3\cdot[21^*_{10}]_n\] \[[42^*_{10}]_n=2\cdot[21^*_{10}]_n\] \[[84^*_{10}]_n=4\cdot[21^*_{10}]_n\]

See Also: Factorization of 211..11 on stdkmd.net

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