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

First few terms (base 10): \[[1^*51^*_8]_n=\{5,105,4937,301641,19190345,\ldots\}\]

First few terms (base 8): \[\{\text{5},\text{151},\text{11511},\text{1115111},\text{111151111},\ldots\}\]

General Formula:\[[1^*51^*_8]_n={8\cdot8^{2n}+28\cdot8^{n}-1\over7}\]

Equivalent Patterns: (none)

Table

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