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A154511
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Primes of the form 648n^2 - 72n + 1.
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2
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577, 31249, 40897, 64081, 77617, 126001, 186049, 208657, 581041, 982801, 1367857, 1616401, 2101249, 2567377, 3836449, 4038481, 4141441, 4566241, 4898449, 5359537, 7691041, 8413201, 8711137, 10941841, 12152449, 13240657, 14183137
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OFFSET
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1,1
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COMMENTS
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The primes occur at n = 1, 7, 8, 10, 11, 14, 17, 18, 30, 39, 46, 50, 57,..
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LINKS
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MATHEMATICA
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Select[Table[648n^2-72n+1, {n, 0, 6001}], PrimeQ] (* Vincenzo Librandi, Jul 23 2012 *)
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PROG
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(Magma) [a: n in [0..200] | IsPrime(a) where a is 648*n^2-72*n+1]; // Vincenzo Librandi, Jul 23 2012
(PARI) (for (n=0, 200, if (isprime (k=648*n^2-72*n+1), print1 (k, “, “)))) ; \\ Vincenzo Librandi, Jul 23 2012
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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Incorrect formula replaced with a comment by R. J. Mathar, Jul 06 2010
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STATUS
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approved
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