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11121: Near Repdigit 11..1121

First few terms (base 10): \[[1^*21_{10}]_n=\{21,121,1121,11121,111121,\ldots\}\]

General Formula:\[[1^*21_{10}]_n={100\cdot10^{n}+89\over9}\]

Equivalent Patterns: \[[3^*63_{10}]_n=3\cdot[1^*21_{10}]_n\] \[[2^*42_{10}]_n=2\cdot[1^*21_{10}]_n\] \[[4^*84_{10}]_n=4\cdot[1^*21_{10}]_n\]

See Also: Factorization of 11..1121 on stdkmd.net

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