20001: Quasi Repdigit 200..001

First few terms (base 10): \[[20^*1_9]_n=\{19,163,1459,13123,118099,\ldots\}\]

First few terms (base 9): \[\{\text{21},\text{201},\text{2001},\text{20001},\text{200001},\ldots\}\]

General Formula:\[[20^*1_9]_n=18\cdot9^{n}+1\]

Equivalent Patterns: \[[40^*2_9]_n=2\cdot[20^*1_9]_n\] \[[80^*4_9]_n=4\cdot[20^*1_9]_n\] \[[60^*3_9]_n=3\cdot[20^*1_9]_n\]

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