55255: Near Repdigit Palindrome 55..55255..55

First few terms (base 10): \[[5^*25^*_9]_n=\{2,428,36662,2987168,242118122,\ldots\}\]

First few terms (base 9): \[\{\text{2},\text{525},\text{55255},\text{5552555},\text{555525555},\ldots\}\]

General Formula:\[[5^*25^*_9]_n={45\cdot9^{2n}-24\cdot9^{n}-5\over8}\]

Equivalent Patterns: (none)

Table

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