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A236761
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Numbers n such that n^4-n+1 is prime.
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3
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3, 6, 9, 13, 16, 18, 19, 24, 33, 39, 43, 45, 46, 60, 63, 64, 69, 75, 78, 79, 85, 91, 94, 105, 106, 108, 109, 115, 121, 129, 138, 174, 175, 183, 195, 198, 205, 210, 220, 249, 250, 276, 289, 295, 300, 309, 313, 318, 324, 343, 346, 348
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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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115^4 - 115 + 1 = 174900511 is prime. Thus, 115 is a member of this sequence.
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MATHEMATICA
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Select[Range[400], PrimeQ[#^4-#+1]&] (* Harvey P. Dale, Jun 03 2015 *)
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PROG
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(Python)
import sympy
from sympy import isprime
{print(n) for n in range(10**3) if isprime(n**4-n+1)}
(PARI)
s=[]; for(n=1, 400, if(isprime(n^4-n+1), s=concat(s, n))); s \\ Colin Barker, Jan 31 2014
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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