25555: Near Repdigit 255..55

First few terms (base 10): \[[25^*_6]_n=\{2,17,107,647,3887,\ldots\}\]

First few terms (base 6): \[\{\text{2},\text{25},\text{255},\text{2555},\text{25555},\ldots\}\]

General Formula:\[[25^*_6]_n=3\cdot6^{n}-1\]

Equivalent Patterns: \[[5^*4_6]_n=2\cdot[25^*_6]_n\] \[[15^*2_6]_n=4\cdot[25^*_6]_n\]

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