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A137463
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Prime numbers p such that p^3 - p + 1 and p^3 + p - 1 are both primes.
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0
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7, 139, 631, 739, 769, 991, 1201, 1231, 2677, 3499, 3931, 4261, 4441, 4861, 6247, 7411, 7699, 8377, 9391, 10711, 10837, 14389, 15139, 15679, 16057, 16561, 18541, 20479, 22861, 28111, 28837, 29917, 30169, 30367, 32089, 33589, 35311, 35677
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OFFSET
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1,1
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LINKS
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EXAMPLE
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7^3 +- 6 -> (337, 349) (both primes),
139^3 +- 138 -> (2685481, 2685757) (both primes).
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MAPLE
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a:=proc (n) if isprime(n)=true and isprime(n^3+n-1)=true and isprime(n^3-n+1) =true then n else end if end proc: seq(a(n), n=1..30000); # Emeric Deutsch, Apr 29 2008
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MATHEMATICA
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Select[Prime[Range[900]], PrimeQ[ #^3-(#-1)]&&PrimeQ[ #^3+(#-1)]&]
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PROG
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(Magma) [ n: n in [0..40000] | IsPrime(n) and IsPrime(n^3-(n-1)) and IsPrime(n^3 +(n-1)) ]; // Vincenzo Librandi, Nov 24 2010
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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