55155: Near Repdigit Palindrome 55..55155..55

First few terms (base 10): \[[5^*15^*_8]_n=\{1,333,23149,1495917,95853421,\ldots\}\]

First few terms (base 8): \[\{\text{1},\text{515},\text{55155},\text{5551555},\text{555515555},\ldots\}\]

General Formula:\[[5^*15^*_8]_n={40\cdot8^{2n}-28\cdot8^{n}-5\over7}\]

Equivalent Patterns: (none)

Table

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