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A154511 Primes of the form 648n^2 - 72n + 1. 2
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
The primes occur at n = 1, 7, 8, 10, 11, 14, 17, 18, 30, 39, 46, 50, 57,..
LINKS
MATHEMATICA
lst={}; Do[p=648*n^2-72*n+1; If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 5*5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jan 27 2009 *)
Select[Table[648n^2-72n+1, {n, 0, 6001}], PrimeQ] (* Vincenzo Librandi, Jul 23 2012 *)
PROG
(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
CROSSREFS
Cf. A154510.
Sequence in context: A202011 A157264 A201046 * A221331 A163042 A069365
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Jan 11 2009
EXTENSIONS
Incorrect formula replaced with a comment by R. J. Mathar, Jul 06 2010
STATUS
approved

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Last modified April 22 02:54 EDT 2024. Contains 371887 sequences. (Running on oeis4.)