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Search: id:A111504
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| A111504 |
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Numbers n such that n^5 - n^3 -1 and n^5 - n^3 +1 are twin primes. |
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1
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| 5, 6, 64, 210, 265, 364, 440, 475, 625, 680, 785, 806, 839, 925, 930, 931, 951, 1044, 1105, 1224, 1226, 1559, 1636, 1651, 1699, 1835, 1850, 1966, 1995, 2295, 2309, 2511, 2541, 2655, 2984, 3100, 3501, 3680, 4159, 4444, 4474, 4580, 4606, 4755, 4779
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OFFSET
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1,1
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EXAMPLE
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5^5-5^3-1=2999
5^5-5^3+1=3001, 2999 and 3001 twin primes so n(1)=5
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MATHEMATICA
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lst={}; Do[If[PrimeQ[n^5-n^3-1]&&PrimeQ[n^5-n^3+1], AppendTo[lst, n]], {n, 10^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 14 2008]
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CROSSREFS
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Sequence in context: A163481 A157805 A132444 this_sequence A041057 A041058 A053611
Adjacent sequences: A111501 A111502 A111503 this_sequence A111505 A111506 A111507
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KEYWORD
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nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Nov 16 2005
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