11511: Near Repdigit Palindrome 11..11511..11

First few terms (base 10): \[[1^*51^*_6]_n=\{5,67,1699,56851,2020723,\ldots\}\]

First few terms (base 6): \[\{\text{5},\text{151},\text{11511},\text{1115111},\text{111151111},\ldots\}\]

General Formula:\[[1^*51^*_6]_n={6\cdot6^{2n}+20\cdot6^{n}-1\over5}\]

Equivalent Patterns: (none)

Table

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