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A100758
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Greatest prime factor of the concatenation of terms of the n-th row of the triangle formed by the Stirling number of the second kind.
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1
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11, 131, 587, 1646443, 6827, 18011869, 9120065483, 363724245921599, 975761724248252813688864599, 17542508725666616033, 111131968773953028264114836512440131291369683
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OFFSET
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2,1
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COMMENTS
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Are these concatenations squarefree?
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LINKS
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FORMULA
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EXAMPLE
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a(4) = 587 is the greatest prime factor of 1761 =3*587.
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CROSSREFS
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KEYWORD
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base,easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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