55515: Near Repdigit 55..5515

First few terms (base 10): \[[5^*15_7]_n=\{12,257,1972,13977,98012,\ldots\}\]

First few terms (base 7): \[\{\text{15},\text{515},\text{5515},\text{55515},\text{555515},\ldots\}\]

General Formula:\[[5^*15_7]_n={245\cdot7^{n}-173\over6}\]

Equivalent Patterns: (none)

Table

No table data.