OFFSET
0,1
COMMENTS
For the first 206 primes p assumed by this quadratic form with x>=0, the number 326 is a primitive root modulo p.
REFERENCES
K. Ireland and M. Rosen, A Classical Introduction to Modern Number Theory. Springer-Verlag, NY, 1982, p. 47.
D. H. Lehmer, A note on primitive roots, Scripta Math., 26 1963 117-119.
Pieter Moree, Posting to Number Theory List, Jun 03, 2004.
LINKS
Robert Israel, Table of n, a(n) for n = 0..10000
Pieter Moree, Primitive root producing quadratics, arXiv:math/0406033 [math.NT], 2004.
MAPLE
P:= x -> 263*x^2+3:
select(isprime, map(P, [$0..1000])); # Robert Israel, Feb 01 2021
MATHEMATICA
Select[Table[263*x^2+3, {x, 0, 800}], PrimeQ] (* Harvey P. Dale, Dec 04 2015 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 03 2004
STATUS
approved