11411: Near Repdigit Palindrome 11..11411..11

First few terms (base 10): \[[1^*41^*_7]_n=\{4,78,2948,138286,6732804,\ldots\}\]

First few terms (base 7): \[\{\text{4},\text{141},\text{11411},\text{1114111},\text{111141111},\ldots\}\]

General Formula:\[[1^*41^*_7]_n={7\cdot7^{2n}+18\cdot7^{n}-1\over6}\]

Equivalent Patterns: (none)

Table

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