31111: Near Repdigit 311..11

First few terms (base 10): \[[31^*_5]_n=\{3,16,81,406,2031,\ldots\}\]

First few terms (base 5): \[\{\text{3},\text{31},\text{311},\text{3111},\text{31111},\ldots\}\]

General Formula:\[[31^*_5]_n={13\cdot5^{n}-1\over4}\]

Equivalent Patterns: (none)

Table

No table data.