51555: Near Repdigit 5155..55

First few terms (base 10): \[[515^*_7]_n=\{36,257,1804,12633,88436,\ldots\}\]

First few terms (base 7): \[\{\text{51},\text{515},\text{5155},\text{51555},\text{515555},\ldots\}\]

General Formula:\[[515^*_7]_n={221\cdot7^{n}-5\over6}\]

Equivalent Patterns: (none)

Table

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