21111: Near Repdigit 211..11

First few terms (base 10): \[[21^*_3]_n=\{2,7,22,67,202,\ldots\}\]

First few terms (base 3): \[\{\text{2},\text{21},\text{211},\text{2111},\text{21111},\ldots\}\]

General Formula:\[[21^*_3]_n={5\cdot3^{n}-1\over2}\]

Equivalent Patterns: (none)

Table

No table data.