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

First few terms (base 10): \[[5^*15^*_{10}]_n=\{1,515,55155,5551555,555515555,\ldots\}\]

General Formula:\[[5^*15^*_{10}]_n={50\cdot10^{2n}-36\cdot10^{n}-5\over9}\]

Equivalent Patterns: (none)

See Also: Factorization of 55..55155..55 on stdkmd.net

Table

No table data.