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Search: id:A117705
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| A117705 |
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Numbers n such that 5^n-n^5 is prime. |
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+0
9
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OFFSET
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1,1
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COMMENT
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a(5) found by Donovan Johnson
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LINKS
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Donovan Johnson, a(5).
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EXAMPLE
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a(1)=2 because 2^5 - 5^2 = 7 is prime
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MATHEMATICA
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Do[If[PrimeQ[(5^n-n^5)], Print[n]], {n, 1, 5000}]
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CROSSREFS
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Sequence in context: A109080 A032461 A072390 this_sequence A031079 A101554 A057018
Adjacent sequences: A117702 A117703 A117704 this_sequence A117706 A117707 A117708
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KEYWORD
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hard,more,nonn
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AUTHOR
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Mohammed Bouayoun (Mohammed.Bouayoun(AT)sanef.com), Apr 13 2006, Jan 08 2008
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