25557: Quasi Repdigit 255..557

First few terms (base 10): \[[25^*7_{10}]_n=\{27,257,2557,25557,255557,\ldots\}\]

General Formula:\[[25^*7_{10}]_n={230\cdot10^{n}+13\over9}\]

Equivalent Patterns: \[[51^*4_{10}]_n=2\cdot[25^*7_{10}]_n\]

See Also: Factorization of 255..557 on stdkmd.net

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