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Search: id:A111503
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| A111503 |
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Numbers n such that n^3 - n^2 -1 and n^3 - n^2 +1 are twin primes. |
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+0
4
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| 2, 3, 6, 13, 21, 33, 48, 58, 90, 96, 99, 111, 118, 120, 121, 133, 138, 195, 204, 279, 334
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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2^3-2^2-1=3
2^3-2^2+1=5, 3 and 5 twin primes so n(1)=2
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MATHEMATICA
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lst={}; Do[If[PrimeQ[n^3-n^2-1]&&PrimeQ[n^3-n^2+1], AppendTo[lst, n]], {n, 10^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Aug 08 2008]
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CROSSREFS
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Sequence in context: A102970 A144771 A054049 this_sequence A075530 A032061 A155996
Adjacent sequences: A111500 A111501 A111502 this_sequence A111504 A111505 A111506
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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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