OFFSET
1,1
EXAMPLE
If n=92 then (23*n^2) - 25 = 194647 (prime).
MATHEMATICA
Select[Range[1000], PrimeQ[23#^2-25]&] (* Harvey P. Dale, Jun 10 2014 *)
PROG
(Magma) [n: n in [2..100000] |IsPrime((23*n^2)-25)]; // Vincenzo Librandi, Nov 13 2010
(PARI) is(n)=isprime(23*n^2-25) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,easy,changed
AUTHOR
Parthasarathy Nambi, Sep 30 2005
STATUS
approved