11311: Near Repdigit Palindrome 11..11311..11

First few terms (base 10): \[[1^*31^*_4]_n=\{3,29,373,5589,87893,\ldots\}\]

First few terms (base 4): \[\{\text{3},\text{131},\text{11311},\text{1113111},\text{111131111},\ldots\}\]

General Formula:\[[1^*31^*_4]_n={4\cdot4^{2n}+6\cdot4^{n}-1\over3}\]

Equivalent Patterns: (none)

Table

No table data.