15559: Quasi Repdigit 155..559

First few terms (base 10): \[[15^*9_{10}]_n=\{19,159,1559,15559,155559,\ldots\}\]

General Formula:\[[15^*9_{10}]_n={140\cdot10^{n}+31\over9}\]

Equivalent Patterns: \[[31^*8_{10}]_n=2\cdot[15^*9_{10}]_n\]

See Also: Factorization of 155..559 on stdkmd.net

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