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Search: id:A128449
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| A128449 |
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Numbers n such that absolute value of 9^n - n^9 is prime. |
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+0
7
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OFFSET
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1,1
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COMMENT
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Three larger terms 18494, 23840 and 36838 found by Donovan Johnson 07-08/2005.
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MATHEMATICA
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lst={}; k=9; Do[If[PrimeQ[Abs[k^n-n^k]], AppendTo[lst, n]], {n, 0, 10^4}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 10 2008]
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CROSSREFS
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Cf. A072180, A109387, A117705, A117706, A128447, A128448, A128450, A128451, A122003, A128453, A128454.
Sequence in context: A027908 A020088 A074140 this_sequence A037514 A037717 A019476
Adjacent sequences: A128446 A128447 A128448 this_sequence A128450 A128451 A128452
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KEYWORD
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hard,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 03 2007
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EXTENSIONS
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3 more terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Feb 22 2008
a(7) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 26 2008
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