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Search: id:A058046
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| A058046 |
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Numbers n such that 5^n - n is prime. |
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+0
1
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OFFSET
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1,1
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COMMENT
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Farideh Firoozbakht reports that the only known prime of the form 5^n + n occurs when n = 7954 and that there are no others up to 20200. Oct 11 2003.
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MATHEMATICA
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Do[ If[ PrimeQ[ 5^n - n ], Print[ n ] ], {n, 1, 13400} ]
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CROSSREFS
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Sequence in context: A062349 A105122 A132076 this_sequence A074180 A126293 A007668
Adjacent sequences: A058043 A058044 A058045 this_sequence A058047 A058048 A058049
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Nov 17 2000
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EXTENSIONS
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The sixth term was found by Farideh Firoozbakht (f.firoozbakht(AT)sci.ui.ac.ir), who reports that there are no others up to 13400, Oct 11 2003
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