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A173295
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Primes of the form n^2+n+1 or n^2+n+9.
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0
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3, 7, 11, 13, 29, 31, 43, 73, 157, 191, 211, 241, 281, 307, 389, 421, 463, 601, 659, 757, 821, 1123, 1483, 1723, 1901, 2459, 2551, 2971, 3089, 3307, 3541, 3907, 4423, 4831, 5113, 5701, 5861, 6007, 6163, 6329, 6481, 7841, 8011, 8191, 9901, 10303, 11131
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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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a(1)=3 because 1^2+1+1=3 is prime, a(3)=11 because 1^2+1+9=11 is prime.
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MATHEMATICA
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Union[Select[Flatten[Table[n^2+n+{1, 9}, {n, 200}]], PrimeQ]] (* Harvey P. Dale, Aug 28 2012 *)
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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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Added 3, removed 133, replaced 607 by 601 - R. J. Mathar, Feb 24 2010
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STATUS
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approved
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