22221: Near Repdigit 22..221

First few terms (base 10): \[[2^*1_3]_n=\{1,7,25,79,241,\ldots\}\]

First few terms (base 3): \[\{\text{1},\text{21},\text{221},\text{2221},\text{22221},\ldots\}\]

General Formula:\[[2^*1_3]_n=3\cdot3^{n}-2\]

Equivalent Patterns: (none)

Table

No table data.