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A069460
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Greatest prime factor of prime(n)^n - 1.
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4
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2, 31, 5, 3221, 157, 25646167, 3833, 7792003, 732541, 150332843, 144061, 17615988547, 6177695707, 461017351, 31129845205681, 361353204962363828785531, 903870199, 751410597400064602523400427092397, 25058741, 153436090543, 1750258119644519
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OFFSET
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2,1
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LINKS
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FORMULA
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EXAMPLE
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A000040(9)^9 - 1 = 23^9 - 1 = 1801152661462 = 2*7*11*19*79*7792003, therefore a(9) = 7792003.
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MATHEMATICA
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Table[FactorInteger[Prime[n]^n-1][[-1, 1]], {n, 2, 30}] (* Harvey P. Dale, May 19 2019 *)
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CROSSREFS
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KEYWORD
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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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