66566: Near Repdigit Palindrome 66..66566..66

First few terms (base 10): \[[6^*56^*_7]_n=\{5,335,16757,823199,40351205,\ldots\}\]

First few terms (base 7): \[\{\text{5},\text{656},\text{66566},\text{6665666},\text{666656666},\ldots\}\]

General Formula:\[[6^*56^*_7]_n=7\cdot7^{2n}-7^{n}-1\]

Equivalent Patterns: (none)

Table

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