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A117705
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Numbers n such that 5^n-n^5 is prime.
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8
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OFFSET
| 1,1
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COMMENTS
| a(5) found by Donovan Johnson
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LINKS
| Donovan Johnson, a(5).
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EXAMPLE
| a(1)=2 because 2^5 - 5^2 = 7 is prime
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MATHEMATICA
| Do[If[PrimeQ[(5^n-n^5)], Print[n]], {n, 1, 5000}]
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CROSSREFS
| Sequence in context: A180877 A032461 A072390 * A031079 A200039 A189331
Adjacent sequences: A117702 A117703 A117704 * A117706 A117707 A117708
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KEYWORD
| hard,more,nonn
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AUTHOR
| Mohammed Bouayoun (Mohammed.Bouayoun(AT)sanef.com), Apr 13 2006, Jan 08 2008
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EXTENSIONS
| First five terms confirmed by Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), Dec 18 2008
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