33133: Near Repdigit Palindrome 33..33133..33

First few terms (base 10): \[[3^*13^*_4]_n=\{1,55,991,16255,261631,\ldots\}\]

First few terms (base 4): \[\{\text{1},\text{313},\text{33133},\text{3331333},\text{333313333},\ldots\}\]

General Formula:\[[3^*13^*_4]_n=4\cdot4^{2n}-2\cdot4^{n}-1\]

Equivalent Patterns: (none)

Table

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