55355: Near Repdigit Palindrome 55..55355..55

First few terms (base 10): \[[5^*35^*_7]_n=\{3,271,13907,685599,33623203,\ldots\}\]

First few terms (base 7): \[\{\text{3},\text{535},\text{55355},\text{5553555},\text{555535555},\ldots\}\]

General Formula:\[[5^*35^*_7]_n={35\cdot7^{2n}-12\cdot7^{n}-5\over6}\]

Equivalent Patterns: (none)

Table

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