55515: Near Repdigit 55..5515

First few terms (base 10): \[[5^*15_9]_n=\{14,419,4064,36869,332114,\ldots\}\]

First few terms (base 9): \[\{\text{15},\text{515},\text{5515},\text{55515},\text{555515},\ldots\}\]

General Formula:\[[5^*15_9]_n={405\cdot9^{n}-293\over8}\]

Equivalent Patterns: (none)

Table

No table data.