55554: Near Repdigit 55..554

First few terms (base 10): \[[5^*4_7]_n=\{4,39,284,1999,14004,\ldots\}\]

First few terms (base 7): \[\{\text{4},\text{54},\text{554},\text{5554},\text{55554},\ldots\}\]

General Formula:\[[5^*4_7]_n={35\cdot7^{n}-11\over6}\]

Equivalent Patterns: \[[14^*1_7]_n=2\cdot[5^*4_7]_n\]

Table

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