20001: Quasi Repdigit 200..001

First few terms (base 10): \[[20^*1_5]_n=\{11,51,251,1251,6251,\ldots\}\]

First few terms (base 5): \[\{\text{21},\text{201},\text{2001},\text{20001},\text{200001},\ldots\}\]

General Formula:\[[20^*1_5]_n=10\cdot5^{n}+1\]

Equivalent Patterns: \[[40^*2_5]_n=2\cdot[20^*1_5]_n\]

Table

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