51111: Near Repdigit 511..11

First few terms (base 10): \[[51^*_{10}]_n=\{5,51,511,5111,51111,\ldots\}\]

General Formula:\[[51^*_{10}]_n={46\cdot10^{n}-1\over9}\]

Equivalent Patterns: \[[25^*_{10}]_n=5\cdot[51^*_{10}]_{n-1}\] \[[76^*5_{10}]_n=15\cdot[51^*_{10}]_n\]

See Also: Factorization of 511..11 on stdkmd.net

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