55655: Near Repdigit Palindrome 55..55655..55

First few terms (base 10): \[[5^*65^*_7]_n=\{6,292,14054,686628,33630406,\ldots\}\]

First few terms (base 7): \[\{\text{6},\text{565},\text{55655},\text{5556555},\text{555565555},\ldots\}\]

General Formula:\[[5^*65^*_7]_n={35\cdot7^{2n}+6\cdot7^{n}-5\over6}\]

Equivalent Patterns: (none)

Table

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