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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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7
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OFFSET
| 1,1
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COMMENTS
| Three larger terms 18494, 23840 and 36838 found by Donovan Johnson 07-08/2005.
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MATHEMATICA
| 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
| Cf. A072180, A109387, A117705, A117706, A128447, A128448, A128450, A128451, A122003, A128453, A128454.
Sequence in context: A020088 A205772 A074140 * A037514 A037717 A019476
Adjacent sequences: A128446 A128447 A128448 * A128450 A128451 A128452
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Mar 03 2007
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EXTENSIONS
| 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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