15555: Near Repdigit 155..55

First few terms (base 10): \[[15^*_7]_n=\{1,12,89,628,4401,\ldots\}\]

First few terms (base 7): \[\{\text{1},\text{15},\text{155},\text{1555},\text{15555},\ldots\}\]

General Formula:\[[15^*_7]_n={11\cdot7^{n}-5\over6}\]

Equivalent Patterns: \[[34^*3_7]_n=2\cdot[15^*_7]_{n+1}\] \[[53^*1_7]_n=3\cdot[15^*_7]_{n+1}\]

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