25555: Near Repdigit 255..55

First few terms (base 10): \[[25^*_9]_n=\{2,23,212,1913,17222,\ldots\}\]

First few terms (base 9): \[\{\text{2},\text{25},\text{255},\text{2555},\text{25555},\ldots\}\]

General Formula:\[[25^*_9]_n={21\cdot9^{n}-5\over8}\]

Equivalent Patterns: \[[52^*1_9]_n=2\cdot[25^*_9]_{n+1}\] \[[7^*6_9]_n=3\cdot[25^*_9]_n\] \[[16^*3_9]_n=6\cdot[25^*_9]_n\]

Table

No table data.