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A084898
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Numbers k such that k^k*k! + 1 is prime.
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3
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OFFSET
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1,2
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COMMENTS
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All terms under 500 correspond to certified primes (Primo 2.2.0 beta). a(10) > 2500. - Ryan Propper, Apr 05 2006
a(11) > 10000. - Eric Snyder, Jun 03 2022
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LINKS
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Table of n, a(n) for n=1..10.
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EXAMPLE
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7 is in the sequence because 7^7*7! + 1 = 4150656721 is prime.
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MATHEMATICA
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Do[If[PrimeQ[n^n*n!+1], Print[n]], {n, 600}]
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CROSSREFS
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Cf. A002981, A002982.
Sequence in context: A100720 A297852 A297953 * A147380 A146606 A101302
Adjacent sequences: A084895 A084896 A084897 * A084899 A084900 A084901
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KEYWORD
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more,nonn
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AUTHOR
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Farideh Firoozbakht, Jul 14 2003
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EXTENSIONS
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a(9) from Ryan Propper, Apr 05 2006
a(10) from Eric Snyder, Jun 03 2022
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STATUS
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approved
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