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Search: id:A128447
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| A128447 |
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Numbers n such that absolute value of 7^n - n^7 is prime. |
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+0
7
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OFFSET
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1,1
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MATHEMATICA
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lst={}; k=7; 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, A128448, A128449, A128450, A128451, A122003, A128453, A128454.
Sequence in context: A110956 A028689 A156269 this_sequence A032622 A104749 A062281
Adjacent sequences: A128444 A128445 A128446 this_sequence A128448 A128449 A128450
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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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a(5) and a(6) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Mar 03 2008
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