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A110912 Numbers n such that 23*n^2 - 36 is prime. 1
1, 7, 13, 31, 43, 55, 97, 101, 113, 119, 133, 139, 151, 161, 167, 185, 199, 211, 221, 227, 239, 265, 277, 283, 295, 305, 323, 353, 371, 385, 403, 407, 427, 451, 461, 463, 475, 515, 517, 539, 557, 559, 581, 613, 617, 641, 661, 685, 689, 697, 713, 767, 769, 773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 1..5000

EXAMPLE

If n=133 then 23*n^2 - 36 = 406811 (prime).

MATHEMATICA

Select[Range[800], PrimeQ[23*#^2 - 36] &] (* Stefan Steinerberger, Feb 28 2006 *)

PROG

(MAGMA) [n: n in [0..1000]| IsPrime(23*n^2- 36)]; // Vincenzo Librandi, Feb 03 2011

(PARI) is(n)=isprime(23*n^2-36) \\ Charles R Greathouse IV, Jun 13 2017

CROSSREFS

Sequence in context: A074963 A283937 A231626 * A240680 A308851 A298027

Adjacent sequences:  A110909 A110910 A110911 * A110913 A110914 A110915

KEYWORD

nonn,easy

AUTHOR

Parthasarathy Nambi, Oct 03 2005

EXTENSIONS

More terms from Stefan Steinerberger, Feb 28 2006

STATUS

approved

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Last modified April 9 22:17 EDT 2020. Contains 333372 sequences. (Running on oeis4.)