55155: Near Repdigit Palindrome 55..55155..55

First few terms (base 10): \[[5^*15^*_9]_n=\{1,419,36581,2986439,242111561,\ldots\}\]

First few terms (base 9): \[\{\text{1},\text{515},\text{55155},\text{5551555},\text{555515555},\ldots\}\]

General Formula:\[[5^*15^*_9]_n={45\cdot9^{2n}-32\cdot9^{n}-5\over8}\]

Equivalent Patterns: (none)

Table

No table data.