55455: Near Repdigit Palindrome 55..55455..55

First few terms (base 10): \[[5^*45^*_7]_n=\{4,278,13956,685942,33625604,\ldots\}\]

First few terms (base 7): \[\{\text{4},\text{545},\text{55455},\text{5554555},\text{555545555},\ldots\}\]

General Formula:\[[5^*45^*_7]_n={35\cdot7^{2n}-6\cdot7^{n}-5\over6}\]

Equivalent Patterns: (none)

Table

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