22221: Near Repdigit 22..221

First few terms (base 10): \[[2^*1_8]_n=\{1,17,145,1169,9361,\ldots\}\]

First few terms (base 8): \[\{\text{1},\text{21},\text{221},\text{2221},\text{22221},\ldots\}\]

General Formula:\[[2^*1_8]_n={16\cdot8^{n}-9\over7}\]

Equivalent Patterns: \[[6^*3_8]_n=3\cdot[2^*1_8]_n\] \[[4^*2_8]_n=2\cdot[2^*1_8]_n\]

Table

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