15557: Quasi Repdigit 155..557

First few terms (base 10): \[[15^*7_{10}]_n=\{17,157,1557,15557,155557,\ldots\}\]

General Formula:\[[15^*7_{10}]_n={140\cdot10^{n}+13\over9}\]

Equivalent Patterns: \[[31^*4_{10}]_n=2\cdot[15^*7_{10}]_n\] \[[62^*8_{10}]_n=4\cdot[15^*7_{10}]_n\]

See Also: Factorization of 155..557 on stdkmd.net

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