31111: Near Repdigit 311..11

First few terms (base 10): \[[31^*_7]_n=\{3,22,155,1086,7603,\ldots\}\]

First few terms (base 7): \[\{\text{3},\text{31},\text{311},\text{3111},\text{31111},\ldots\}\]

General Formula:\[[31^*_7]_n={19\cdot7^{n}-1\over6}\]

Equivalent Patterns: \[[62^*_7]_n=2\cdot[31^*_7]_n\]

Table

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