25555: Near Repdigit 255..55

First few terms (base 10): \[[25^*_7]_n=\{2,19,138,971,6802,\ldots\}\]

First few terms (base 7): \[\{\text{2},\text{25},\text{255},\text{2555},\text{25555},\ldots\}\]

General Formula:\[[25^*_7]_n={17\cdot7^{n}-5\over6}\]

Equivalent Patterns: \[[54^*3_7]_n=2\cdot[25^*_7]_{n+1}\]

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