15556: Quasi Repdigit 155..556

First few terms (base 10): \[[15^*6_7]_n=\{13,90,629,4402,30813,\ldots\}\]

First few terms (base 7): \[\{\text{16},\text{156},\text{1556},\text{15556},\text{155556},\ldots\}\]

General Formula:\[[15^*6_7]_n={77\cdot7^{n}+1\over6}\]

Equivalent Patterns: \[[34^*5_7]_n=2\cdot[15^*6_7]_n\] \[[53^*4_7]_n=3\cdot[15^*6_7]_n\]

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